Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2befe37f5f685db…

MALICIOUS

PDF

80.4 KB Created: 2021-07-16 18:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a9d29a5155a054dc4f2d32cd750e20d SHA-1: cc69beff9969eb498d1d9c07c5c6f282f169d318 SHA-256: b2befe37f5f685dbb81c9beaf9a5df24af0094f865c431b1e5c54e207bc63ba2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains an embedded URL that, while currently flagged as benign, is suspicious in the context of a malicious document. The PDF structure itself is also flagged for duplicate object bodies, indicating potential obfuscation. No scripts were extracted, but the presence of an external URI suggests an attempt to redirect the user to a malicious resource, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/-7-cX3opz_8/square?utm_term=short+hair+party+hairstyle
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8f07f19a9f87deb70b01e/1625878655824/45058527264.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ecaade36ee212f66d231b3/1626122974869/to_be_in_disguise.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec8670fe047727940bf7f8/1626113648280/38905349819.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_off0000d92a.bin
8e6c7fa354e0d26ad9c844c8d9d29cdb7a7fc920bb3c9e5b12d6ef4651dac5f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 10436 bytes
font_01_sfnt_off0000f0f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 16792 bytes
font_02_sfnt_off0001090b.bin
2b4fbb3100c2890c1e62a5b1cdcfe24ddd87e40d02da3835a65638b42d09704d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1090B 16764 bytes

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