Malicious PDF — malware analysis report

Static analysis result for SHA-256 823ff2b3bc6d47f5…

MALICIOUS

PDF

74.0 KB Created: 2021-07-19 06:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4703db04a8a720f1bff702f09757e472 SHA-1: 3cdbf57331efd0a98ea5b30a29087a0aff748ed0 SHA-256: 823ff2b3bc6d47f5f88f1a5f327e5ac35de7784cd8bd38f1c2a8af571ade554a
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 flagged as benign in this instance, is part of a pattern often used in phishing lures. The PDF's metadata indicates it was generated by wkhtmltopdf, a tool sometimes used to create malicious documents. No scripts were extracted, but the presence of embedded URLs and the ClamAV signature strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2686

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/X6hrLWyzjlw/square?utm_term=science+class+9+atoms+and+molecules+pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ed9283dacdbe35d62be994/1626182275495/is_volume_extensive_or_intensive.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec97ba831aaf5e928bfe60/1626118074759/where_do_i_find_cyclops_fragments_in_subnautica.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_off0000c040.bin
c7361c038499518b3fee32afb642adba943794e8e3460377a72b002fb42dedbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC040 16428 bytes
font_01_sfnt_off0000eae5.bin
84d77a1c53a339d1302067e795936ca7e8a59be35c4ae6625f109ef8c962cb2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 11024 bytes
font_02_sfnt_off00010484.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10484 16792 bytes

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