Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f579d32e5876f0b…

MALICIOUS

PDF

78.7 KB Created: 2021-07-14 09:27:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 895287259781e106a579014318058e97 SHA-1: 7504847c480d609a2f9081dc98e21a3e15990b62 SHA-256: 5f579d32e5876f0bf5f9537cf8170ea55f4c2c9b8c78d9cbb77cac154fe59469
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated maliciousness. The embedded URL, while marked as benign, points to a domain that is often used in phishing lures. The document body is heavily obfuscated, preventing a clear understanding of its direct intent, but the overall indicators point towards a phishing attack.

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/razvivatel/yapz/~3/UkUWPC8UKDU/square?utm_term=fear+of+being+gay
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60eca1e41951226b8b8dc836/1626120676280/best_app_to_maintain_expenses.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e9434a0a287971af9b0669/1625899851007/jukutoj.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ee1b392af4c01978fa574f/1626217273417/a_veterinary_doctor.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_off0000d6d8.bin
b6b7d72ded0141b6164f5567c96b07654f32771bbdc03349a04da6847adcfd12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 16056 bytes
font_01_sfnt_off0000ffe7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 16792 bytes
font_02_sfnt_off000117fe.bin
ad95a9141018ad32bfac50d2797832b742e0ce7316b6e4f0aabb9c41d0c314a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 10308 bytes

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