Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d7120e2d628ccd…

MALICIOUS

PDF

107.3 KB Created: 2018-06-12 09:41:10 -04:00
MD5: ce201eb53d8eeffd948c16201708b763 SHA-1: fd9d058e56995b4e6196d000453b174032a14f90 SHA-256: 29d7120e2d628ccdbdbc445465afed00f07c59e5670ea029b911f7be044cb568
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document leverages JavaScript to display a fake Adobe Acrobat updater prompt, attempting to lure the user into clicking 'OK'. Upon user interaction, the embedded JavaScript executes a form submission to a malicious URL, likely to download a secondary payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9477

Heuristics 8

  • PDF auto-runs JavaScript form submission on open critical PDF_OPENACTION_JS_SUBMITFORM
    PDF uses /OpenAction to run JavaScript that calls submitForm() with an external HTTP(S) URL. Opening the document triggers the outbound submission path without requiring a normal link click.
  • PDF JavaScript shows fake Acrobat updater prompt high PDF_FAKE_ACROBAT_UPDATE_LURE
    PDF JavaScript displays Acrobat/update-themed language such as a document rendering engine update or remote connection to Adobe servers. When paired with JavaScript or external submission, this is a social-engineering lure rather than benign document text.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://2fa.com-token-auth.com/XV0U5a2F5OXFURFZ6Y1RsSFFXcEZSWEZ6VUc5RmJsRTFSVFpEWkdzM1p6Qk5aMDlyYlhaa09UQXpORlpzVjNnMFFVWXlObU0xTlU5b1ZWQkhORlF3YUdveFMwbHJVQ3R4U0ZSdGFVNDNSa3gxYWxaUFJsUXdjRVpyUVRBNEszTllUM0ozUkZJMVZWWlBhMWs5TFMxUU0wUnlZVFJYY2xwYVQxWXhWMlZCVjBkVlpIRjNQVDA9LS04MGY4NjkzZGQ0ZWJjMDk2Y2UxYWU0MDE1ZDFhNjEzZDZmZjc5MTQz?cid=890734190#FDF
    • https://2fa.com-token-auth.com/XVTJWd1FrbHVTREpsVVM5TVoyaGlSVEJMY2xoalV6TTBVWGR0Wmxrd1dtTnZlbXB2UTFrMVQxUndXak5WV0hGRk9TOHJNRTFTTjJZeVRpdDFMMHg2TUdNM1MxcHNWMFJPWXpoQllYSnNaVWt3SzJGVFNFUlJSUzlJYzJGWFRuQlVka1Z5TmxjeFRGWnBlV2hTWnpkRWNGVjNjMEZ5VkhKM1NqRnRlV2hhUVZwT2RVZEdiazVXVFhwYWJVcDJia2hYUVhOVU1VTkNia2RNWm1aTFZtWmthVlJYZVdVNVEyOVpUVUZaUFMwdGRHWjVUWEZrYWsxc2MyTnhaekJPYTNFMmQxUmlRVDA5LS1hNjEyZmU5Mzk5ODI3ZGYwNDNmOTA4YzAxMjlmNGEyYzM3N2Y0YWM3?cid=890734190
    • https://2fa.com-token-auth.com/XUmpkVlVFNUhORGcwVlhNNFNFZFJkaXRXV1VscVNFcHNVM016UTBsQlYzUjFTMjFRV1ZkbFZubFVTMFYxVWtSYVdscG9ZamhyZVV0TWRERkVUeXRLTldoeFRYVjFNVXBhUkU5RlNsTjVaMmRvT0VVNVNqZG9OVGcwY1dWVmRITk9VbTVQZHk5M09HVndTRWhaYzFKUVUwWkdSWEF6ZDFWVk9Va3ZMeTltTmpWWk1IbDZUR280ZVdsUlZrUm5OMnN5V0hNekt6bEVTM1ZZTlZac1ltRkZlalJLZERZMk5UWjJNVTVCUFMwdFVTOVZWR1JLT0ZKaVRWaHJXRWswTTBORVpXaDFkejA5LS1kNDdmNzFjZjZkODljNDc2ODhjYThhZTdlZWRiMWVhOTA2NTNmODdj?cid=890734190
    • https://2fa.com-token-auth.com/XTkZOQllVRktUSFkxZFV0a2IwWndTRWxwVUhKaU1UbElZMUJWWkRRMlNrY3ZPREJYV21VeGJVRnFaelpOU2tvNVVGcEdkMFF2TWpkSVpGTlZRVGRCVkU1elNrbEZMMnBhTUVob1YwMWhkVGRTTlcxRGVubG9aazFGTjBoSVZYVTFUbEJvVDNrcmVrNUZjVWRFYTJWTmFGaG5aRUlyZUc1cFVuRXhVMnBLV1VGb1dVbDBaRzluZFRCNVluQldZVmxLYldNelVVbDRPUzlzVDBWTU5tdGFkRXc1WmtZMVlVaG5lWGxaUFMwdGJtRllkRzkxVUVOTlNuRmFkSE41Y2xwSWRYWjFaejA5LS05MTcyZmMyN2YyYzY3OTg0ODZjMjYwNmQ0Mjc5ZTU4ZGM3MDk1ODI0?cid=890734190
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
0ad864ac792c42f9a5931be36b6605a8114a9df3ff0fc9b9593a3faf24860028		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 600 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
6dc493dc860deaa9dad8c3fad6dfbda762b3d8ceb6fda13de55682491622f5af		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103722 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off0001964f.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x1964F 4575 bytes

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