Malicious PDF — malware analysis report

Static analysis result for SHA-256 810b3e76a4476dbc…

MALICIOUS

PDF

73.3 KB Created: 2021-07-13 21:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d766a6499f52e344760646b42cb63968 SHA-1: 98f1adf34ccc5f48744b1cb9bdd7a9339f6af077 SHA-256: 810b3e76a4476dbce4e78083c6ed6d545dfed944e069410d7a81e3943fb50c1d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains an embedded URI pointing to a suspicious external website. ClamAV detected this file as a phishing trojan, and an ML classifier also flagged it as malicious. The embedded URL is the primary indicator of a phishing attempt, likely to trick the user into visiting a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7185

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://oniceh.ru/square?utm_term=pillars+of+the+earth+series
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ec881a4c0b954f9ea4a809/1626114074582/word_problems_using_pythagorean_theorem.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7cb0d8f757b1ac450c21a/1625803533317/nilugujajuzaloxowoluvajip.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e92739320dbd0de281447f/1625892665101/use_edification_in_a_sentence.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_off0000c001.bin
77a81c9da9ce89f6a3d968737f7c025c20947a0fb5b5f95f3dda934ff571f7ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC001 10208 bytes
font_01_sfnt_off0000d702.bin
fe88061e8072bc04d12ded9995fed827b807ca100d5d9ed3a38e5df5bc76e6a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD702 16344 bytes
font_02_sfnt_off0001015c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1015C 16792 bytes

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