Malicious PDF — malware analysis report

Static analysis result for SHA-256 904c867ec175e667…

MALICIOUS

PDF

70.9 KB Created: 2021-07-17 20:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ef8ec438be34a39182614932daeda0f SHA-1: 3bf37e4dc9de7686abb7009520573f2efe8ac213 SHA-256: 904c867ec175e667ba2a6037ddd454d6de66eae807f8de7c77d49d461254d2b9
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains an embedded URL that, while currently flagged as benign, is indicative of a phishing or malware distribution attempt. The PDF structure and metadata suggest it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents. No scripts were extracted, limiting the analysis of direct execution behavior.

Machine Learning

  • Nyx PDF Classifier clean score 0.2342

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://feedproxy.google.com/~r/sq/ugae/~3/J-SxIuB37Ms/square?utm_term=gastritis+after+gastric+bypass
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f0b53b6e9a9a494a9e57f5/1626387771330/24997670157.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8d66c2b0f0e19af677f68/1625871980994/6908553780.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC5 16792 bytes
font_01_sfnt_off0000d3d7.bin
b3657cceb82b4d4266763fb2cdb06f15afcac6f18d9253740ea0bcd7c54cf8e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 14336 bytes
font_02_sfnt_off0000f78a.bin
41ac8e26eb697ad433ebfa8de31eb688db34ae4454ffcc75cf8a50c9cf24ffe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 10676 bytes

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