Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b163323883b8f5…

MALICIOUS

PDF

76.6 KB
MD5: 8163d9b3a50f94e20d5752bb11f77108 SHA-1: c4bf67a3cbb5a6a270783bbbcafeb535357cd415 SHA-256: 70b163323883b8f59c32768ebdc7783ec830790759a02957e635e9178b7efd7a
236 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript that uses the exportDataObject and nLaunch functions to automatically launch an embedded file named 'ScanData736232.docm' upon opening. This behavior is characteristic of a dropper, designed to initiate a multi-stage attack. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • exportDataObject + nLaunch — embedded-file launch-on-open dropper critical PDF_JS_EXPORT_LAUNCH_DROPPER
    PDF JavaScript calls exportDataObject() with nLaunch set, which extracts the document's embedded file and launches it in its default application. This is a launch-on-open dropper: the embedded file is the payload. No benign workflow auto-launches an extracted PDF attachment.
  • ClamAV: Pdf.Dropper.Agent-7271397-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7271397-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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 http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
57bf408c7525458ed58ae59dc57a7d0574cb6b453ab2e3e735ab93a94db61471		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x576 80202 bytes
Detection
ClamAV: Doc.Downloader.Donoff-10030369-0
Obfuscation or payload: unlikely
javascript_obj0012_000.js
4687332957d1ecf70010ba835088575021f7334ecec9e6e69d7903a94460f6dd		 pdf-javascript-stream PDF /JS object 12 at offset 0x25E 98 bytes

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