Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a718d94ae607ee…

MALICIOUS

PDF

81.3 KB Created: 2021-07-20 02:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c8fad365cbfa17f5b8c1b085368069d SHA-1: bc09dc6b7b1083203b55d0dfde435f38e7d76465 SHA-256: 20a718d94ae607ee982f5ce06d8d10e962c3c49a28d09e897456993f93f41c03
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, despite some being marked as benign, suggests an attempt to redirect the user to external content. The PDF structure and embedded artifacts are consistent with a phishing or malware delivery mechanism, likely involving a spearphishing attachment as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9031

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/AG-UZpNbJGc/square?utm_term=looney+tunes+barber+of+seville
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f5ed10314a9e4df85745a1/1626729744632/85675898081.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f48b0832548145d7977424/1626639112395/sewage_mostly_constitutes.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee548a6d75c50a5d455b17/1626231946200/nodixuvaloxi.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ede86de11d817478d30e86/1626204269991/xakor.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60f0ab143c307813f1a7bcf2/1626385172929/chemical_composition_of_cells_lab_answers.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e802cfefb14d112212eebf/1625817807422/sovoxufufimajafuvuzaloga.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8a1332bd7a9201623416b/1625858355826/9548476579.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_off0000db38.bin
d7a6c59a0c5a0202b9dccacb4d649a3c87087c5fd5378c956b361c69c19d2c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 17408 bytes
font_01_sfnt_off000108ba.bin
eb2cc338a14828ef588c9caa60602a0bc6b562b953f100f477319eb22d40e732		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 10584 bytes
font_02_sfnt_off00012117.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 16792 bytes

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