Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f807571910751a…

MALICIOUS

PDF

19.8 KB Created: 2009-08-31 22:24:57 +08:00 Authoring application: Acrobat 编辑器 9.0 (via Adobe Acrobat 9.1.2)
MD5: 8ecbaa710b88ce8c2f5492afecd50ba5 SHA-1: 476cf3727ea1887aca7252552decd2c2c98d3553 SHA-256: 48f807571910751aef91d79986ceeb85eac81d6d296eedf1dbf778ada9c412f5
202 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV with the signature Swf.Malware.Agent-7104323-0, indicating the presence of a known Flash-based malware. The PDF also contains embedded Flash files (SWF), which are likely the source of the malware. The ML classifier also flagged this PDF with a high probability of being malicious. The embedded Flash content is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9821

Heuristics 6

  • ClamAV: Swf.Malware.Agent-7104323-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Swf.Malware.Agent-7104323-0
  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/
    • http://adobe.com/AS3/2006/builtin

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
flash1.swf
70e6dbce3b11aaece2d38f1d315dee7736c7ab9138a74cdadc8126393c857018		 pdf-embedded-file PDF EmbeddedFile object 54 at offset 0x2972 781 bytes
flash2.swf
d3c429777daa7827232558cfe778a75f27510e79589d23d998a17cddf3fac717		 pdf-embedded-file PDF EmbeddedFile object 56 at offset 0x2D8A 8164 bytes
Detection
ClamAV: Swf.Malware.Agent-7104323-0
Obfuscation or payload: unlikely

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