Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f61aecaa7eb3f27…

MALICIOUS

PDF

76.3 KB Created: 2021-07-15 13:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3e52de21c7aeccc9eb6e136884a61e1 SHA-1: d7ad16bfe5dc78240ad177b8ec41a39693143ec8 SHA-256: 8f61aecaa7eb3f2714df7fa1e458a48f3d57276a00c735cc68595e508a335d71
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL pointing to 'crysiq.ru', which is likely a phishing or malware distribution site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the malicious URL strongly suggests a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9163

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://crysiq.ru/square?utm_term=presidential+debate+questions+answers
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60eff38696309e3685aa308a/1626338182553/66970605942.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60edb68003cb9e0b597b8380/1626191489434/write_any_two_role_of_entrepreneur.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e8cb30dd5c0c1026ef2bbc/1625869104791/78851458595.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60eff379d052060b21f65246/1626338169473/29725703772.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec7b0e7e5cd11affcc3c2f/1626110734261/charging_by_conduction_and_grounding_answers.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ede3bd6f118478735c9ed5/1626203069876/tojukure.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edfcca77fc8e778b5a9198/1626209482532/jevawanabewidobot.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_off0000ca14.bin
a186d1d639ce62fb6062dfd5a7797252bddcfd7752beef46e5b6761769d71a3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA14 10712 bytes
font_01_sfnt_off0000e29c.bin
caad6802a8dbc582fb4258b18e0014ba1bb66a69757f4ac2c88fe0516a184579		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 16556 bytes
font_02_sfnt_off00010d57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 16792 bytes

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