Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8c4c8a79e537a8…

MALICIOUS

PDF

107.4 KB Created: 2018-06-12 09:41:10 -04:00
MD5: 9ad05bfa778d52ad3b7fb61e5ed99db4 SHA-1: 647e07aa6d40680c8d85b91dbcce6292db97dd74 SHA-256: 2a8c4c8a79e537a84c7800e2211017862eba9e6a5179bf63be3cf56a5ed2badb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains JavaScript that triggers a fake Adobe Acrobat Updater prompt, attempting to trick the user into allowing a remote connection. The script then attempts to submit form data to the URL https://robust-backend.ancillarycheese.com/. This behavior is consistent with a phishing lure designed to download further malicious content or steal information.

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://robust-backend.ancillarycheese.com/XTjNkUWQyOW1WR3hXUlU1TlJVbzBlSFJMVFhjM01VWjZSbmxIYjBOSloxWjVZMU4yWmpSNldGcGpNV0UyUmxjMVQyRlVOM1pDYmpVcldGaG5NblIzY0dJMlIxWnFZMGx2WTNCTlVqaDNjbUYxVWl0RGNWVkVaRTFtYkdremIxQnZPRUUxVVNzd1owSkxZVms5TFMxQloxb3JSSFZKVjNaSlkzaDNlazV4Ykc1S1pHSlJQVDA9LS1iYTVhODdmODdjZDg0ZGM5NGE5MzBiY2Y2ZTExOTMzODgwNTYwZDA3?cid=904071737#FDF
    • https://robust-backend.ancillarycheese.com/XYVUxemVrRmpPU3RzSzJselRtZEJWMkYwUWxKelEwc3lPVkExZFdwamIzUmxZMDVsY25sdVduUndiME5CTWtaeFVWcGFNbXBLUW5WQ09HZGxTMHRDTUhnNWFFdFpNbGxZUkZsMUwxUkdabGRaU21nNGEyZEhLMG8wUzBOeVoweFhkUzluTnpaRldXdDJiMXB1WlZsVVVsZEJSRzhyYjFOa09VMDBhVmhpVWxWS04wbGtielZYYTBwUk9YRkdRMWxCU0dKdFZtbHhUalJFWjNadVdqZEtSM0pWYVRaSGRHcHJVWGt3UFMwdGN6QjRWR2M0V0RGdGJGcHJkbTVLWkdOTlJHNXZkejA5LS01MGE4OTA1MDRiY2VjNTQxMDllYWYwNzViNzFiNmJhMDIxNTM2MjNk?cid=904071737
    • https://robust-backend.ancillarycheese.com/XTmpCWFNqbGhaRVVyUVRWMVJESndLMjFuZEhOb2VWWlVUalJNUm5kUU4yeFZiSGRCTkZoRFlqVlpNa1ZETlZCcFNua3lSMGR2TkVoMWVGQk9kbnB1VEhONlVUVTVjVkpWWjFsdWRuUlJLemx6ZGpGclowdzVhV1IzUjFsdVdVTkNMM2xSV25WYU56aEpaRzA0VVdGRlpEbEJRemN3WkU5S1ZIRkxVMU50ZGxSc2JTdEdVbHBTVm5wcGJVcHJSMmxQYkVOYWVqVldjV3R4SzFKUWFVTlZSaTlYWjBWdlptWjJWVVk0UFMwdFdpOUpTbTFJWVVReGVHVnlZblpQTm5Kek9UbFVVVDA5LS00YjJhNjFlYjZiOTNlNTljNGU3MDI0OWY3NDY4ZjIyZDkyNjI0ODQ1?cid=904071737
    • https://robust-backend.ancillarycheese.com/XTkdOb05GcFBZM0JwWjJwYVdYTXphMDlaZDFSMGQxWkZRelJxVVU5aVNXa3libWwyZDFsTFNVeHlhVVZZZFdGbVNXVnpNR2RIVVc1bVZGcG5abEpaUkU5QlJpOVFjRTFEYldOSGJUZGlVV0pyYlRGTlVqTlBSSGRrVW5oclVIQkxUVE5wZUZod1oxRnVkRnB6Wm1sdVRqTldWRlZhZDBWSGJUVnBPV0YzU21aSmNucDFZaTlKVjJSeVYxYzRPVmQ0VWk5UWFHTXZRbXB0S3prMVVXZHRWa1ZQTWxwVWFrMWhUSGRqUFMwdE56RnFLekk0WjBKM2VVMUNhbTh2U3pCb2VVRktaejA5LS0xNTFmZDcwNzY5MTA4YWI2ZWQxNzEwMDU5MTMwOGY0ZTY2MTMyMWE2?cid=904071737
    • 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
a4c37a195dd96de5618d1a8102e7e58f6082569ae62ce7b2a5a950bd71587393		 pdf-javascript-stream PDF /JS object 12 at offset 0x180A 612 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
javascript_obj0012_001.js
69dea17acf8614e9974dd7ee0f1eb933024b6d9a9f0c1ec47e3cae987f3f3901		 pdf-javascript-stream PDF /JS object 12 at offset 0x1831 103770 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 long base64-like blob(s).
font_00_cff_off0001967f.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x1967F 4575 bytes

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