Malicious PDF — malware analysis report

Static analysis result for SHA-256 de275d7cbefb5d52…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: c40a28a4d11d9932b99c0bc2c4932ba6 SHA-1: 6b3bbda624df14d40c4e7235a0f690a6bf8a82e3 SHA-256: de275d7cbefb5d52767028d06a64ea4e9df0a8402e3fe499c870a3fc563e0d31
160 Risk Score

Malware Insights

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

The PDF document contains JavaScript that triggers a fake Adobe Acrobat update prompt, aiming to deceive the user into downloading a payload. The embedded JavaScript explicitly calls the submitForm function with a URL, indicating an attempt to download and execute a second-stage exploit or malware. The ML classifier also strongly flagged this PDF as malicious.

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://05kqatnrJ9s0sNAh9.phish.farm/XZURkS2MzWTVRMWd3T1VsQldtWXhlbFUwY1hVeFVWYzNTemwwTjI4eWRHRkNZak5UYjNOSmREZFJUa2hIV2pBeFRIUTFNRFZ3TW1WUWFWWjZkelV6T1d4eFNtbDRSblpUTVRocWJESjVPVE14U1U5eFdGWlFSblpITjJwWlR6WmxMMGhGTWxRdlQwZG5jM005TFMxSVkwRkhVazFhTkVsc1NHTlFNWE5XUlRkR1NqUm5QVDA9LS1jMzcwY2U0ZmQ0NmM4ODU2ZjhjZTIyNTIyNmM5NGJiYzg3ZDY3OWRl?cid=909417466#FDF
    • https://05kqatnrJ9s0sNAh9.phish.farm/XYVZsQ1QyUTNaRUZ3TUdsRVdIbFJkbk40VjBaUVpqVTJiakprYVVnelJGaE9lREI0YWxOVkx6VlVOMjR2TjFkdGJHTlpjRUUyTjBwdVJFOXNWbkZLYUROT2NVazJRVmszZFdaaEwyeFlZamgzUTNVek5scHNWVWxoUXpCelJFUlFhakpEUm5Nck0wbEtlRU0wWkhoWGIyOXRhRnBVZVdaTmVrdGpMMHB0ZG5kUUx5dDBaRzFuY1VWVlJYUTRTa0YwY21KVE5qSXplRTVqUVhSR1JGaE1kRGRKUnpnelkyTjVNbkZuUFMwdFEzUkxiblJwT0ZObFNYSXJXRFJ3UTJSNWRWRXdaejA5LS0wM2IwMWVhOTdhZDVlZWJhMGUyYmVkNzJjYTFiY2ZhMmFlYjkxOTdk?cid=909417466
    • https://05kqatnrJ9s0sNAh9.phish.farm/XWWpFemNUTTVMemxsVjJSME16VldNM05MZHprelFtWnBLMjlQTHpSSGNrOVRURnBwVGt4blIwVnlSalZvUmt4S00yd3pTV3RsU0VneWNsZFNOMWhGTWk5WU5YQjVVV0ZoZEZoT2VYTkZlR0VyWkhwbGVWWnlLM1YzTWtGbU9HdGhUVVJJU0RoalIxUTFhMVZVUm5aWFdDdHlXalU0V1hSSlJqazVPVkZ2WlhnM1JtbEJPVUY2ZG01RllYSnFTbHB5T1dJNVYyZFpZV3hVTUV0TU5FcFRMMUpLWjFwUUsyOHdMMVJKUFMwdE1IRkZZamxFVG1GNWIzUXpWREp1VTJ3d0sySnRRVDA5LS01ZjllODUwNjdhYzIzNDE4OTM0NTNiYWY1YTE2MjA1Nzg0MmFmZDc3?cid=909417466
    • https://05kqatnrJ9s0sNAh9.phish.farm/XWldaM2FtMUxOSEp5UlRkWU5TOTBWalk0UVdsQmRHbHZhVFpOVVd4dmJsZFNOMkpWVm01MmRqaDNZazExTURNclpUbE9iV0V5TUVVd1FXSnRkbk5HVWk5QlFrZ3ZWM2hrVFRkTGExQklaSEZpY2s1ak1XNVdhRmhZUVhNMll6TTBLMmN5Tm1WMVpHNUxRMW8xTnpST2JYQTBWMDVzY1dKelRIa3lXSG92ZDBaV2NrcDJZbXc1UzFkblJYRXZaVll5VWpBNFVUQlZkbUo1VjBoRk5qQkJjSGxPUjNSd1RqRk1SMU0wUFMwdE16aG1NMnhhZFdoRlVXUjRNek42VXprNWFqY3pkejA5LS0yMDNlOGU4NGNhOTY2NmFjODc4ZjBlYTY4MjMxMzRlNzdlNTY3ZGZm?cid=909417466
    • 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
0d0864d3a4434458f0081125c7657f88ace5d626478d5996b547e7d571886566		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 606 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
7d69c1f3fb899e06ff19c1679ede1198d7931c504fa43bb9dd0482cff28662ca		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103746 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off00019667.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x19667 4575 bytes

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