Malicious PDF — malware analysis report

Static analysis result for SHA-256 019e2b99f3c0f5e1…

MALICIOUS

PDF

46.9 KB Created: 2010-07-19 14:26:50 -06:00 Authoring application: Acrobat PDFMaker 9.1 for Microsoft Outlook (via Adobe PDF Library 9.0)
MD5: c0b80b08b689f680d81afde12cf2a912 SHA-1: ded85b28d27cfe0f8f72c1844e1c365a817d5bc1 SHA-256: 019e2b99f3c0f5e1f4be996964945407eedef1c33288a680a7c3ae940fce9684
138 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is identified as a malicious PDF by ClamAV, specifically Win.Trojan.Cycler-241. It contains an embedded file named 'w2form.doc' and an external URI pointing to an email address, suggesting a phishing or malware delivery attempt. The presence of embedded artifacts and the ClamAV detection strongly indicate a malicious payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4500

Heuristics 5

  • ClamAV: Win.Trojan.Cycler-241 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Cycler-241
  • 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
  • External URI low PDF_URI
    PDF contains an external URL action
  • 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/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://www.iec.ch

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
w2form.doc
83c19704c312d322aa3604f264a90861c74a3479e3f6bd55a0e31954e6db38b4		 pdf-embedded-file PDF EmbeddedFile object 27 at offset 0x31F9 106156 bytes
Detection
ClamAV: Win.Trojan.Cycler-241
Obfuscation or payload: unlikely
icc_00_off00001b0a.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x1B0A 3144 bytes
icc_01_off00002562.icc
653b586c4707574ffcd648ba35494daed2c76ceafcf4c07d315ed961b1dc347f		 pdf-icc-profile PDF ICC profile at offset 0x2562 408 bytes

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