Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db57159a6045551…

MALICIOUS

PDF

54.7 KB Created: 2007-06-22 15:18:31 -07:00 Authoring application: Adobe InDesign CS2 (4.0) (via Adobe PDF Library 7.0)
MD5: e10f74ec49596394df44d9fece6968c2 SHA-1: 442311e04d9d3fea6542af11c998d78af0df4022 SHA-256: 4db57159a6045551f6962eaf2506537df0a767bde87b2684332ad67b575e3ffb
128 Risk Score

Malware Insights

The PDF file was detected as malicious due to the presence of an embedded EICAR test signature. This signature is a standard way to test antivirus software and is often used by malware authors to ensure their delivery mechanisms are functional. The embedded artifact is named 'eicar.com'.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3864

Heuristics 4

  • ClamAV: Eicar-Test-Signature critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Eicar-Test-Signature
  • 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.
  • 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/xap/1.0/g/img/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
eicar.com
275a021bbfb6489e54d471899f7db9d1663fc695ec2fe2a2c4538aabf651fd0f		 pdf-embedded-file PDF EmbeddedFile object 36 at offset 0xD6F2 68 bytes
Detection
ClamAV: Eicar-Test-Signature
Obfuscation or payload: unlikely

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