Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99bfe98ed75dc9b…

MALICIOUS

PDF

85.7 KB
MD5: ddbd06f227b192d435d5085d13bc82e0 SHA-1: b130c368d4223432dde3eb27c7a20204a41356f4 SHA-256: f99bfe98ed75dc9b3372310c218a2219733a14c3be28f8bd2407301c34d71f3b
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 executes upon opening, displaying a fake Adobe Acrobat updater prompt to lure the user. It then attempts to submit form data to a remote URL, likely to download a second-stage payload. The presence of a fake updater and the submission of data to a suspicious domain strongly indicate a malicious intent to exploit the user's trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8400

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://guru.phishing.guru/XYjBkcFJrbHFOMDQ1UVVrMVFqQlllSFF5VGxOVk1VUnVUMDF2VjA1clpYSm5ZazFPUlZNeE0zWm9ZbTlaU1ZGdWRpdFBkbXg2U2tsb1JVdDBOVFUxVmxoVGFtYzFaVWxhVEZoeGFWaFBXSGhHY2pNcmFEZE1kVzQzYjA0eWRpdFpVRk5LTjAxQ1ZIZ3JNelE5TFMxMVdrSlRXVkZwZFZCMlNUaFhXVzFvUzFSUE5VeG5QVDA9LS0wZTFkMGQ0MzBkZWMwNjM3NWExMDM1OTZmZDEzNWRlZGFkYWYwYWU2?cid=909946341#FDF
    • https://guru.phishing.guru/XVUVKUVZYRlBabEZXTmxORlZFRTBTakF4YlZsaWFFaERORXRXV1M5UmIxWTJaWGRXZURKbmIzZHVSV2RyUjFOUVJEaHdOalpIU1Zodk5WSlFaMXBpY2xoclIySjJZelpDT0ZKVVNtbEpiRGh2VWxWeGMxbzROMjEzWnprNWFEZGpOMFUzVjBoVlVsUTVhRVpLYVZseWFFNUNWbUV5VXprekwxaHdWa1p2Ym5
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0016_000.js
9a7e552154b81aca42855c18fdd1e6088e9dce4b72fc1f302f7a47969e5c118f		 pdf-javascript-stream PDF /JS object 16 at offset 0x348 597 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
font_00_cff_off0000177f.bin
9340d372ad75a105fdb1627a30e96f892e0dc7d9588c0150cf06b4fa72281cc0		 pdf-font-stream PDF embedded font (cff) at offset 0x177F 4575 bytes

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