Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cab066f0259d0f6…

MALICIOUS

PDF

76.2 KB Created: 2021-07-13 19:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64b5d968d9b072bad7dd922333228b08 SHA-1: 9d1eb0e54fb15aa608b9d3d5d46db8bf9184b9da SHA-256: 6cab066f0259d0f6a2abb01c74b439b7b518c0d4de75cfdf9eb1ee0a3e5a69cb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier also indicated maliciousness. An external URI pointing to 'allytemp.ru' was extracted, which is likely the destination for the phishing attempt. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9001

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://allytemp.ru/square?utm_term=gk+answers+and+questions
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e965d1e6a58043b69387e6/1625908689130/gupidi.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60edb2d8834e745de9d2b50d/1626190552819/tuwufojilomawulovi.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec9e92973f9128ac6d3e11/1626119826648/adding_fractions_4th_grade_worksheets.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e7d11ed0799e4214c01bf0/1625805086581/20250711415.pdf
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8c4ac4be6b65fb4b10468/1625867436191/52346953840.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_off0000c978.bin
c23c974d78c69a1e507bcb87eab1d4ffe3e59ac837b04095bd0e610740f9ff21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 16624 bytes
font_01_sfnt_off0000f4bb.bin
f2e4c01f244b13d8ae501e4b88660b3e634384ea604eb5d75f42c7cc47b12906		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 10660 bytes
font_02_sfnt_off00010d30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 16792 bytes

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