Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f294cc26cd32da…

MALICIOUS

PDF

87.5 KB Created: 2021-07-15 20:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e9f7cc4aabef4920e5c9396c3485f163 SHA-1: 979d73e17942b18da5d0db6e30fef8340f8886b7 SHA-256: 82f294cc26cd32daf94526d37c17845da7065a8cf0a1a4be60216889c84fb205
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded external URI pointing to a suspicious domain, which is likely part of a phishing or credential harvesting scheme. No scripts were extracted, but the presence of the malicious URL is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8083

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://archism.ru/square?utm_term=shallow+root+vegetables
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ee1f46c27d1e40a547fcc7/1626218310720/chris_anderson_makers.pdf
    • https://static1.squarespace.com/static/60aac5994c6b1805bc4acbdb/t/60ee5ace27fa864c7d1397bc/1626233550667/short_notes_for_civil_engineering.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ecef76ff6d86145b99e2a6/1626140534114/eastwood_off_licence.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60ed9e1b5e50ea0df8e04589/1626185243421/what_is_a_young_female_pig_called.pdf
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60e82d0969e16759cf78e938/1625828617333/introduction_to_systems_engineering.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_off0000f51a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51A 16792 bytes
font_01_sfnt_off00010d31.bin
474c50b12e90fa761f495aa084d1f4b85cd08a04aff74a9a46eec2f3f7e07035		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D31 10556 bytes
font_02_sfnt_off00012585.bin
ecb736c72cf377be2c0c8f55a515b2d9eec8d5596095bfac0383546b5df8c210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12585 17216 bytes

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