login.blockchahiin.com Open in urlscan Pro
35.197.11.131  Malicious Activity! Public Scan

URL: https://login.blockchahiin.com/
Submission: On December 18 via automatic, source certstream-suspicious

Summary

This website contacted 3 IPs in 1 countries across 3 domains to perform 14 HTTP transactions. The main IP is 35.197.11.131, located in Mountain View, United States and belongs to GOOGLE - Google LLC, US. The main domain is login.blockchahiin.com.
TLS certificate: Issued by Let's Encrypt Authority X3 on December 18th 2019. Valid for: 3 months.
This is the only time login.blockchahiin.com was scanned on urlscan.io!

urlscan.io Verdict: Potentially Malicious

Targeting these brands: Blockchain (Crypto Exchange)

Domain & IP information

IP Address AS Autonomous System
12 35.197.11.131 15169 (GOOGLE)
1 52.202.176.41 14618 (AMAZON-AES)
1 104.18.93.71 13335 (CLOUDFLAR...)
14 3
Domain Requested by
12 login.blockchahiin.com login.blockchahiin.com
1 wallet-helper.blockchain.com login.blockchahiin.com
1 swallets.herokuapp.com login.blockchahiin.com
14 3
Subject Issuer Validity Valid
login.blockchahiin.com
Let's Encrypt Authority X3
2019-12-18 -
2020-03-17
3 months crt.sh
*.herokuapp.com
DigiCert SHA2 High Assurance Server CA
2017-04-19 -
2020-06-22
3 years crt.sh
ssl565925.cloudflaressl.com
COMODO ECC Domain Validation Secure Server CA 2
2019-08-25 -
2020-03-02
6 months crt.sh

This page contains 2 frames:

Primary Page: https://login.blockchahiin.com/
Frame ID: BEFD644265A0AFA3E73E5E0000134967
Requests: 13 HTTP requests in this frame

Frame: https://wallet-helper.blockchain.com/wallet-helper/matomo/
Frame ID: 59692680A07C188EFEB3AD35C97B0084
Requests: 1 HTTP requests in this frame

Screenshot


Detected technologies

Overall confidence: 100%
Detected patterns
  • headers server /nginx(?:\/([\d.]+))?/i

Page Statistics

14
Requests

100 %
HTTPS

0 %
IPv6

3
Domains

3
Subdomains

3
IPs

1
Countries

10654 kB
Transfer

10640 kB
Size

0
Cookies

Redirected requests

There were HTTP redirect chains for the following requests:

14 HTTP transactions

Resource
Path
Size
x-fer
Type
MIME-Type
Primary Request /
login.blockchahiin.com/
2 KB
2 KB
Document
General
Full URL
https://login.blockchahiin.com/
Protocol
H2
Security
TLS 1.3, , AES_256_GCM
Server
35.197.11.131 Mountain View, United States, ASN15169 (GOOGLE - Google LLC, US),
Reverse DNS
131.11.197.35.bc.googleusercontent.com
Software
nginx / PHP/7.3.12 PleskLin
Resource Hash
cc2620601c5d4a19a5a035dbcb36f343314d20c1d6e95b6c32f1600a6a816979

Request headers

:method
GET
:authority
login.blockchahiin.com
:scheme
https
:path
/
pragma
no-cache
cache-control
no-cache
upgrade-insecure-requests
1
user-agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36
sec-fetch-user
?1
accept
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
sec-fetch-site
none
sec-fetch-mode
navigate
accept-encoding
gzip, deflate, br
Upgrade-Insecure-Requests
1
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36
Sec-Fetch-User
?1

Response headers

status
200
server
nginx
date
Wed, 18 Dec 2019 10:23:17 GMT
content-type
text/html; charset=UTF-8
content-length
1713
x-powered-by
PHP/7.3.12 PleskLin
manifest.1572777479426.js
login.blockchahiin.com/
4 KB
4 KB
Script
General
Full URL
https://login.blockchahiin.com/manifest.1572777479426.js
Requested by
Host: login.blockchahiin.com
URL: https://login.blockchahiin.com/
Protocol
H2
Security
TLS 1.3, , AES_256_GCM
Server
35.197.11.131 Mountain View, United States, ASN15169 (GOOGLE - Google LLC, US),
Reverse DNS
131.11.197.35.bc.googleusercontent.com
Software
nginx / PleskLin
Resource Hash
34fb4c40cda7368a7e364c7478c57d8d0f6fe37cd2b8e94cf2041f3f7da2d595

Request headers

Referer
https://login.blockchahiin.com/
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Wed, 18 Dec 2019 10:23:17 GMT
etag
"5dbeb0e4-e14"
last-modified
Sun, 03 Nov 2019 10:50:12 GMT
server
nginx
x-powered-by
PleskLin
content-type
application/javascript
status
200
accept-ranges
bytes
content-length
3604
vendor.4560c224e5.js
login.blockchahiin.com/
6 MB
6 MB
Script
General
Full URL
https://login.blockchahiin.com/vendor.4560c224e5.js
Requested by
Host: login.blockchahiin.com
URL: https://login.blockchahiin.com/
Protocol
H2
Security
TLS 1.3, , AES_256_GCM
Server
35.197.11.131 Mountain View, United States, ASN15169 (GOOGLE - Google LLC, US),
Reverse DNS
131.11.197.35.bc.googleusercontent.com
Software
nginx / PleskLin
Resource Hash
77db7809f2030096d94a29d87d7e6d148434e3fdfe472a927bfd93f28886c63f

Request headers

Referer
https://login.blockchahiin.com/
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Wed, 18 Dec 2019 10:23:17 GMT
etag
"5dbeb0e4-613eb6"
last-modified
Sun, 03 Nov 2019 10:50:12 GMT
server
nginx
x-powered-by
PleskLin
content-type
application/javascript
status
200
accept-ranges
bytes
content-length
6373046
app.a31f988c46.js
login.blockchahiin.com/
3 MB
3 MB
Script
General
Full URL
https://login.blockchahiin.com/app.a31f988c46.js
Requested by
Host: login.blockchahiin.com
URL: https://login.blockchahiin.com/
Protocol
H2
Security
TLS 1.3, , AES_256_GCM
Server
35.197.11.131 Mountain View, United States, ASN15169 (GOOGLE - Google LLC, US),
Reverse DNS
131.11.197.35.bc.googleusercontent.com
Software
nginx / PleskLin
Resource Hash
3594d21b75d0912b6b5887aebd6fcead238d99edb4951a0dd990703334b95d38

Request headers

Referer
https://login.blockchahiin.com/
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Wed, 18 Dec 2019 10:23:17 GMT
etag
"5dbeb0e3-2d62f4"
last-modified
Sun, 03 Nov 2019 10:50:11 GMT
server
nginx
x-powered-by
PleskLin
content-type
application/javascript
status
200
accept-ranges
bytes
content-length
2974452
log
swallets.herokuapp.com/
1 B
270 B
Image
General
Full URL
https://swallets.herokuapp.com/log
Requested by
Host: login.blockchahiin.com
URL: https://login.blockchahiin.com/
Protocol
HTTP/1.1
Security
TLS 1.2, ECDHE_RSA, AES_128_GCM
Server
52.202.176.41 Ashburn, United States, ASN14618 (AMAZON-AES - Amazon.com, Inc., US),
Reverse DNS
ec2-52-202-176-41.compute-1.amazonaws.com
Software
openresty/1.7.4.1 / Express, ARR/3.0
Resource Hash
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

Request headers

Referer
https://login.blockchahiin.com/
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

Date
Wed, 18 Dec 2019 10:23:18 GMT
Via
1.1 vegur
Etag
W/"1-oPFJCiDQIRyZe0S8NX4Zct6riuM"
Server
openresty/1.7.4.1
X-Powered-By
Express, ARR/3.0
Content-Type
text/html; charset=utf-8
Connection
keep-alive
Content-Length
1
vendors~zxcvbn.7128c3bb8e.js
login.blockchahiin.com/
801 KB
802 KB
Script
General
Full URL
https://login.blockchahiin.com/vendors~zxcvbn.7128c3bb8e.js
Requested by
Host: login.blockchahiin.com
URL: https://login.blockchahiin.com/manifest.1572777479426.js
Protocol
H2
Security
TLS 1.3, , AES_256_GCM
Server
35.197.11.131 Mountain View, United States, ASN15169 (GOOGLE - Google LLC, US),
Reverse DNS
131.11.197.35.bc.googleusercontent.com
Software
nginx / PleskLin
Resource Hash
1a050cd46b13bc3e58f7cae7c5d7b072b957d34795f10cd03d4b3a5c7f229023

Request headers

Referer
https://login.blockchahiin.com/
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Wed, 18 Dec 2019 10:23:19 GMT
etag
"5dbeb0e4-c841c"
last-modified
Sun, 03 Nov 2019 10:50:12 GMT
server
nginx
x-powered-by
PleskLin
content-type
application/javascript
status
200
accept-ranges
bytes
content-length
820252
wallet-options-v4.json
login.blockchahiin.com/Resources/
10 KB
11 KB
Fetch
General
Full URL
https://login.blockchahiin.com/Resources/wallet-options-v4.json
Requested by
Host: login.blockchahiin.com
URL: https://login.blockchahiin.com/app.a31f988c46.js
Protocol
H2
Security
TLS 1.3, , AES_256_GCM
Server
35.197.11.131 Mountain View, United States, ASN15169 (GOOGLE - Google LLC, US),
Reverse DNS
131.11.197.35.bc.googleusercontent.com
Software
nginx / PleskLin
Resource Hash
bf8175aa6eb5f03ae8928f557b7b727a7eac7605d44094e9581ab404c29e37e9

Request headers

Referer
https://login.blockchahiin.com/
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Wed, 18 Dec 2019 10:23:19 GMT
last-modified
Sun, 03 Nov 2019 11:01:00 GMT
server
nginx
x-powered-by
PleskLin
etag
"5dbeb36c-29f4"
content-type
application/json
status
200
accept-ranges
bytes
content-length
10740
/
wallet-helper.blockchain.com/wallet-helper/matomo/ Frame 5969
0
0
Document
General
Full URL
https://wallet-helper.blockchain.com/wallet-helper/matomo/
Requested by
Host: login.blockchahiin.com
URL: https://login.blockchahiin.com/vendor.4560c224e5.js
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
104.18.93.71 , United States, ASN13335 (CLOUDFLARENET - Cloudflare, Inc., US),
Reverse DNS
Software
cloudflare /
Resource Hash
Security Headers
Name Value
Content-Security-Policy script-src 'self' 'nonce-X81d3n5sk8tvYvoSpGZ4uidcNLcgHPG2'; connect-src 'none'; object-src 'none'; media-src 'none'; font-src 'none'; style-src 'self'; img-src 'self'
Strict-Transport-Security max-age=31536000; includeSubDomains; preload
X-Content-Type-Options nosniff
X-Xss-Protection 1; mode=block

Request headers

:method
GET
:authority
wallet-helper.blockchain.com
:scheme
https
:path
/wallet-helper/matomo/
pragma
no-cache
cache-control
no-cache
upgrade-insecure-requests
1
user-agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36
accept
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
sec-fetch-site
cross-site
sec-fetch-mode
nested-navigate
referer
https://login.blockchahiin.com/
accept-encoding
gzip, deflate, br
Upgrade-Insecure-Requests
1
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36
Referer
https://login.blockchahiin.com/

Response headers

status
200
date
Wed, 18 Dec 2019 10:23:25 GMT
content-type
text/html; charset=utf-8
set-cookie
__cfduid=dc645c928ea67f1415f80293746eea1e71576664605; expires=Fri, 17-Jan-20 10:23:25 GMT; path=/; domain=.blockchain.com; HttpOnly; SameSite=Lax
vary
Accept-Encoding Accept-Encoding
cache-control
no-cache
content-security-policy
script-src 'self' 'nonce-X81d3n5sk8tvYvoSpGZ4uidcNLcgHPG2'; connect-src 'none'; object-src 'none'; media-src 'none'; font-src 'none'; style-src 'self'; img-src 'self'
x-blockchain-cp-b
wallet-helper
x-cache-status
MISS ea5f003406bf17f48617e132e0f746c5
x-blockchain-language
en
x-blockchain-language-id
0:0:0 (en:en:en)
x-request-id
90cda22e41e7f89096dcd336b9bf696b
x-original-host
wallet-helper.blockchain.com
x-blockchain-server
BlockchainFE/1.0
x-blockchain-cp-f
xwwk 0.001 - 90cda22e41e7f89096dcd336b9bf696b
strict-transport-security
max-age=31536000; includeSubDomains; preload
x-content-type-options
nosniff
x-xss-protection
1; mode=block
via
1.1 google
alt-svc
clear
cf-cache-status
DYNAMIC
expect-ct
max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
server
cloudflare
cf-ray
54706bd64b0c2bec-AMS
content-encoding
gzip
blockchain-vector.svg
login.blockchahiin.com/img/
2 KB
3 KB
Image
General
Full URL
https://login.blockchahiin.com/img/blockchain-vector.svg
Protocol
H2
Security
TLS 1.3, , AES_256_GCM
Server
35.197.11.131 Mountain View, United States, ASN15169 (GOOGLE - Google LLC, US),
Reverse DNS
131.11.197.35.bc.googleusercontent.com
Software
nginx / PleskLin
Resource Hash
79e13bf6f1807722899eca8859b0338ac6b599fe9d2186a87a30e08aaa8b0470

Request headers

Referer
https://login.blockchahiin.com/
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Wed, 18 Dec 2019 10:23:25 GMT
etag
"5dbeb0e2-9df"
last-modified
Sun, 03 Nov 2019 10:50:10 GMT
server
nginx
x-powered-by
PleskLin
content-type
image/svg+xml
status
200
accept-ranges
bytes
content-length
2527
apple-app-store-badge.svg
login.blockchahiin.com/img/
201 KB
202 KB
Image
General
Full URL
https://login.blockchahiin.com/img/apple-app-store-badge.svg
Protocol
H2
Security
TLS 1.3, , AES_256_GCM
Server
35.197.11.131 Mountain View, United States, ASN15169 (GOOGLE - Google LLC, US),
Reverse DNS
131.11.197.35.bc.googleusercontent.com
Software
nginx / PleskLin
Resource Hash
84ce7559188190b8d41473867822b5dad5a35e39b18cc34f5fb6999b97a9258a

Request headers

Referer
https://login.blockchahiin.com/
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Wed, 18 Dec 2019 10:23:25 GMT
etag
"5dbeb0e2-32581"
last-modified
Sun, 03 Nov 2019 10:50:10 GMT
server
nginx
x-powered-by
PleskLin
content-type
image/svg+xml
status
200
accept-ranges
bytes
content-length
206209
google-play-badge.svg
login.blockchahiin.com/img/
9 KB
9 KB
Image
General
Full URL
https://login.blockchahiin.com/img/google-play-badge.svg
Protocol
H2
Security
TLS 1.3, , AES_256_GCM
Server
35.197.11.131 Mountain View, United States, ASN15169 (GOOGLE - Google LLC, US),
Reverse DNS
131.11.197.35.bc.googleusercontent.com
Software
nginx / PleskLin
Resource Hash
92fa4a2749c258e16f6be4e09d7e0b1c4f052d5b999ca5ff543fbd3dffcd72d3

Request headers

Referer
https://login.blockchahiin.com/
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Wed, 18 Dec 2019 10:23:25 GMT
etag
"5dbeb0e2-2445"
last-modified
Sun, 03 Nov 2019 10:50:10 GMT
server
nginx
x-powered-by
PleskLin
content-type
image/svg+xml
status
200
accept-ranges
bytes
content-length
9285
Inter-Medium-a381cfb3175a21bb6d97b55f1e1e74d3.otf
login.blockchahiin.com/fonts/
227 KB
227 KB
Font
General
Full URL
https://login.blockchahiin.com/fonts/Inter-Medium-a381cfb3175a21bb6d97b55f1e1e74d3.otf
Protocol
H2
Security
TLS 1.3, , AES_256_GCM
Server
35.197.11.131 Mountain View, United States, ASN15169 (GOOGLE - Google LLC, US),
Reverse DNS
131.11.197.35.bc.googleusercontent.com
Software
nginx / PleskLin
Resource Hash
136f99ea23bd03d1b20e410c58c04fa9a720deccfdcf41e42af4e84eccc43b13

Request headers

User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36
Referer
https://login.blockchahiin.com/
Origin
https://login.blockchahiin.com

Response headers

date
Wed, 18 Dec 2019 10:23:25 GMT
etag
"5dbeb0e2-38b60"
last-modified
Sun, 03 Nov 2019 10:50:10 GMT
server
nginx
x-powered-by
PleskLin
content-type
application/vnd.oasis.opendocument.formula-template
status
200
accept-ranges
bytes
content-length
232288
Inter-SemiBold-c285bc5012025a237827762c8e2ade02.otf
login.blockchahiin.com/fonts/
227 KB
228 KB
Font
General
Full URL
https://login.blockchahiin.com/fonts/Inter-SemiBold-c285bc5012025a237827762c8e2ade02.otf
Protocol
H2
Security
TLS 1.3, , AES_256_GCM
Server
35.197.11.131 Mountain View, United States, ASN15169 (GOOGLE - Google LLC, US),
Reverse DNS
131.11.197.35.bc.googleusercontent.com
Software
nginx / PleskLin
Resource Hash
e540fd1257265c8ae13f6ff70af1af80b469af8f42deed8491c3c0be712ba10e

Request headers

User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36
Referer
https://login.blockchahiin.com/
Origin
https://login.blockchahiin.com

Response headers

date
Wed, 18 Dec 2019 10:23:25 GMT
etag
"5dbeb0e2-38d90"
last-modified
Sun, 03 Nov 2019 10:50:10 GMT
server
nginx
x-powered-by
PleskLin
content-type
application/vnd.oasis.opendocument.formula-template
status
200
accept-ranges
bytes
content-length
232848
icomoon-6d98d54c2a33799738bb0193585b2872.ttf
login.blockchahiin.com/fonts/
28 KB
28 KB
Font
General
Full URL
https://login.blockchahiin.com/fonts/icomoon-6d98d54c2a33799738bb0193585b2872.ttf
Protocol
H2
Security
TLS 1.3, , AES_256_GCM
Server
35.197.11.131 Mountain View, United States, ASN15169 (GOOGLE - Google LLC, US),
Reverse DNS
131.11.197.35.bc.googleusercontent.com
Software
nginx / PleskLin
Resource Hash
1820439f144469bc1344864d5b6e50de3ff0df341a04071af819e98ce043aaa7

Request headers

User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36
Referer
https://login.blockchahiin.com/
Origin
https://login.blockchahiin.com

Response headers

date
Wed, 18 Dec 2019 10:23:25 GMT
etag
"5dbeb0e2-6f60"
last-modified
Sun, 03 Nov 2019 10:50:10 GMT
server
nginx
x-powered-by
PleskLin
content-type
application/font-sfnt
status
200
accept-ranges
bytes
content-length
28512

Verdicts & Comments Add Verdict or Comment

Potentially malicious activity detected
Disclaimer: These verdicts should be used to detect potentially malicious websites, not as a final verdict!

urlscan

Phishing against: Blockchain (Crypto Exchange)

18 JavaScript Global Variables

These are the non-standard "global" variables defined on the window object. These can be helpful in identifying possible client-side frameworks and code.

object| onformdata object| onpointerrawupdate string| NONCE object| webpackJsonp object| __core-js_shared__ object| core function| setImmediate function| clearImmediate object| regeneratorRuntime boolean| _babelPolyfill object| __SECRET_EMOTION__ object| __$$GLOBAL_REWIRE_REGISTRY__ function| __rewire_reset_all__ number| __$$GLOBAL_REWIRE_NEXT_MODULE_ID__ object| scCGSHMRCache object| intlTelInputUtils function| createTestXlmAccounts function| zxcvbn

0 Cookies

8 Console Messages

Source Level URL
Text
console-api log URL: https://login.blockchahiin.com/app.a31f988c46.js(Line 1)
Message:
=======================================================
console-api log URL: https://login.blockchahiin.com/app.a31f988c46.js(Line 1)
Message:
%c Wallet version 4.24.1 font-size: 18px;
console-api log URL: https://login.blockchahiin.com/app.a31f988c46.js(Line 1)
Message:
=======================================================
console-api log URL: https://login.blockchahiin.com/app.a31f988c46.js(Line 1)
Message:
%c STOP!! background: #F00; color: #FFF; font-size: 24px;
console-api log URL: https://login.blockchahiin.com/app.a31f988c46.js(Line 1)
Message:
%c This browser feature is intended for developers. font-size: 18px;
console-api log URL: https://login.blockchahiin.com/app.a31f988c46.js(Line 1)
Message:
%c If someone told you to copy-paste something here, font-size: 18px;
console-api log URL: https://login.blockchahiin.com/app.a31f988c46.js(Line 1)
Message:
%c it is a scam and will give them access to your money! font-size: 18px;
console-api log URL: https://login.blockchahiin.com/app.a31f988c46.js(Line 1)
Message:
TypeError: Cannot read property 'contentWindow' of null