Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd04db7c09f87cbd…

MALICIOUS

PDF

77.3 KB Created: 2021-07-15 21:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9443e5efa964eb73e7064d08fc23bdc SHA-1: 412789c46797e9c67a79e482568b36fb6eb5e169 SHA-256: bd04db7c09f87cbd91b25d00547098d8c0698629b491e294ba4a6b241e62af8f
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating it's a phishing trojan. A critical heuristic detected an external URI pointing to 'smidgel.ru', which is highly suspicious given the context. The document body, though truncated, suggests a lure related to a 'masterclass download', reinforcing the phishing pretext. No scripts were extracted, but the presence of a malicious URL is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.2489

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://smidgel.ru/square?utm_term=james+patterson+masterclass+download
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec7a5a82b4c978cf40a7ff/1626110554807/mighty_med_season_1_episode_22.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee718b39b82603386d43b4/1626239371994/govow.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_off0000cd5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 16792 bytes
font_01_sfnt_off0000e575.bin
64e2b72b2eb3d97473954d70ef1469f72ea87074089b1c3c6ea9e39928e9657e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 10660 bytes
font_02_sfnt_off0000fded.bin
2d578e2bc4cbbd30aa293301fae45dbfbe25968704518a96836726db13134eda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDED 16820 bytes

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