Malicious PDF — malware analysis report

Static analysis result for SHA-256 73881dbb0f2ed4a6…

MALICIOUS

PDF

80.1 KB Created: 2021-07-13 18:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95e6274e71f4d0430da9a2f0279b86ee SHA-1: dbba8d9f5e77f11f4a6206c5faa6419941b1b3a4 SHA-256: 73881dbb0f2ed4a66d2c76aa4d6f46ff6fafdb819b0e16f83bc6d2f536358a2f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. While the document body is heavily obfuscated and unreadable, the presence of an embedded URL and the ML classifier's high confidence score indicate a malicious intent. The PDF_URI heuristic points to a Google feedproxy URL, which is often used to obscure the true destination of a link. No scripts were extracted, but the overall structure and detection suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8298

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/razvivatel/yapz/~3/4Ji06Fp1PxY/square?utm_term=best+food+for+heart
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60e95bebc91b61347ea54c1e/1625906155800/promissory_note_purchase_agreement.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ec91fe8c19ad4998dc272f/1626116606555/23800013656.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60ecc9a48cc5f05e71da5b08/1626130852121/suvepuselefevef.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec8c9dc32416487af012c6/1626115229981/67493183186.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e7684d80ff20575044c070/1625778253119/five_types_of_conflict.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_off0000d898.bin
3163a7f8c341b8c3b81297da0f422bcfb1bb862367d993177779206e6682d8ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 10264 bytes
font_01_sfnt_off0000efd6.bin
cc490982f4a11966efcee1a2c9593e2adb5baaf34bc7d5567405a0f816382c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD6 17104 bytes
font_02_sfnt_off00011c9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 16792 bytes

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