Malicious PDF — malware analysis report

Static analysis result for SHA-256 367ee9f5f1b990be…

MALICIOUS

PDF

81.9 KB Created: 2021-07-13 22:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaa9c3bd228ba3e35bd355d94bd5a438 SHA-1: 9668b305f571e69392bbefd2b995db0b147ce405 SHA-256: 367ee9f5f1b990be271b665c970dc37cbab913516d542d0bf4537f02c7e9c3b8
106 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed a heuristic firing for a browser extension installation lure, indicating a social-engineering attempt to trick the user. While no scripts were extracted, the PDF structure and embedded URLs suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.1234

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/CcIy6vlvkUk/square?utm_term=stop+pdf+from+opening+in+browser
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ed38837ab2906137d3d798/1626159235479/sultana_please_pickup_the_phone.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7911bed7e6304395fbb18/1625788699232/the_real_christopher_columbus.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc86.bin
c06758fec7a4e582f201ceec62875f61e7adfd3b82fef05d355fa4bf6f3bfd2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC86 10932 bytes
font_01_sfnt_off0000e57b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 16792 bytes
font_02_sfnt_off0000fd8d.bin
217e0086f9b8e69479a3769120cce5d5c35327ffb51af5e25835d167d8932f4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 15296 bytes
font_03_sfnt_off0001248d.bin
dae5038d748b2b7d89173d83a61ff0ceefc2856cc76f3bb6f5837745f88f8889		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1248D 16084 bytes

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