Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf65aa0fd0f9a7fc…

MALICIOUS

PDF

78.3 KB Created: 2021-07-13 09:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f44bfcf7a9fdba4e0bbe371e17c83b63 SHA-1: 43d642fcf0a950ef33b34633947dd7eed6c3c6ce SHA-256: bf65aa0fd0f9a7fc8ec0f3f348f0fdd0c08037f265a0dc2d6d1374c4d75644c2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to a suspicious domain, which is likely used to redirect the user to a phishing site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI and the overall malicious verdict strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8740

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://nomylo.ru/square?utm_term=proportions+word+problems+pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec9036cd1a1204f6c91ea8/1626116150730/zalado.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e946d15fa2eb14b90cefd1/1625900753989/airport_job_interview_questions_and_answers.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec868d7a1add4dee1fcc9e/1626113677496/grokking_the_system_interview_free.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60e963402dabf27235564123/1625908033024/jemebawijorube.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e7d20d48fdc25940406588/1625805325564/sofadajaner.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60ec9c4e44349d7bb06ea772/1626119247067/how_to_use_activator_rails.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_off0000cfd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD4 16792 bytes
font_01_sfnt_off0000e7e6.bin
caef5ff2b7ab4bf6df62a94b7155d6796a7693222fa250fbbf5adbd51f00687f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 17152 bytes
font_02_sfnt_off000114e4.bin
b6ede78b2e7ac95d924325984dba4d5e176e168f6477f32fb96d4b8a008d028e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114E4 10724 bytes

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