Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31bd66616c72bb8…

MALICIOUS

PDF

74.0 KB Created: 2021-07-16 15:05:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b824a949b3cd0fcf638814a90689a6a2 SHA-1: 358974a96687c54cec7544e988fa3ef6ecf8a628 SHA-256: a31bd66616c72bb80eb21539cec43fabcda451064499b79a0b6b0392054a7fae
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to trick users into believing it's a password-protected archive, a common tactic for evading gateway security. The embedded URLs, while mostly benign, point to a pattern of using external resources for payload delivery. The ClamAV detection confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7882

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/HbdJGeoIq_s/square?utm_term=need+for+speed+most+wanted+trainer+download
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f13e02311eab0d81acca13/1626422786462/sasir.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60eca8e4f4b4775d04a2d3c9/1626122468541/27500956514.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60f09696d3c08952e134f71d/1626379926275/smallest_night_of_the_year.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec858ec3fb560d26f312a4/1626113423157/sports_illustrated_swimsuit_2012.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_off0000c0ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EA 16792 bytes
font_01_sfnt_off0000d901.bin
90a9b7bd8c63cf7ff5156a29b05210a6a021f20240668fdffd17d276696c385a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 10720 bytes
font_02_sfnt_off0000f1a5.bin
835ba68ca206fbf188c90ce75838ac37f3b54f9617038fa339e39e49886db90a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 16572 bytes

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