Malicious PDF — malware analysis report

Static analysis result for SHA-256 7232538d3765436e…

MALICIOUS

PDF

76.5 KB Created: 2021-07-13 17:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7a6680a8d50693657a5c7c861dec92d SHA-1: e55431df32eea4069ca535b7b284f216a74b5146 SHA-256: 7232538d3765436efa0daa0945b5e9676ef430ea1e714539654df9a59a734a7b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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://feedproxy.google.com/~r/sq/ugae/~3/4aHNpQc2m6I/square?utm_term=radiation+physics+lecture+notes
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e8718e47593a5cf72e7ce4/1625846158713/25763566355.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e914f3f4fe78435a3a3007/1625887987356/73361278935.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec8254fd54eb070825bf95/1626112597162/which_cause_typhoid.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec7e61c8b0d544b6d713da/1626111585578/plants_vs_zombies_2_unlimited_coins_and_gems.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e8f8e718245d33f1801106/1625880807282/automata_and_complexity.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_off0000c811.bin
17e5730a035f79fa3ad52f55cbc50d968e522dfe7e175f10911c9e1316d5c548		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC811 16796 bytes
font_01_sfnt_off0000f33f.bin
bd3cd8dab10a7c1e275eb2b4572521e3219fd113bce6a85a6edd1b6b9e46a387		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 10872 bytes
font_02_sfnt_off00010c54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 16792 bytes

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