Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f90f87e4e052e0…

MALICIOUS

PDF

286.1 KB Created: 2021-07-13 22:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22c4a2a06b1d2227d9a8fa2b383d6c4d SHA-1: f5096fef609153ce806898f67344d096da2311cc SHA-256: 39f90f87e4e052e068e0e8d57d8b4fe51429ec5236056308adca86192717e3d1
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. The presence of urgency language ('account will be terminated', 'action required within 24 hours') suggests a phishing attempt. While no scripts were extracted, the PDF structure and embedded URI indicate potential for malicious content delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.2071

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/UZrB20b2Dcg/square?utm_term=practical+applications+in+sports+nutrition+6th+edition+free+pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e7eb465eabb22f35db6065/1625811782184/classical_social_theory.pdf
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60e91250cc7c086459264f11/1625887312319/vasectomy_cost_without_insurance.pdf
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60e8376ffdc75e32ab0b3cbd/1625831279762/piviti.pdf
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ecf11c67dd777ebfbaf7cf/1626140956159/average_lifespan_of_a_daddy_long_legs_spider.pdf
    • https://static1.squarespace.com/static/60aac4dd19f082755c4e5c69/t/60ed933d6be96a4ec40c427c/1626182461832/30595960614.pdf
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60e8e51a1448b061984597a5/1625875738842/91835081581.pdf
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e8f1afcc7c08645924d21d/1625878959957/39693391812.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_off0003defb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3DEFB 16792 bytes
font_01_sfnt_off0003f70c.bin
d01a05dd54b2c08cd12bcc7631adab8de1dc46979762a1f5a8bbf1da87a945ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F70C 21668 bytes
font_02_sfnt_off00041c51.bin
f6027b381a9f517d74c80096c37344969bf03299d65ac50b79cae617612bf6c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x41C51 10984 bytes
font_03_sfnt_off000435be.bin
a7b5ad50ffa78940255546a0eaa1d0aadc37e6ebc54b8cd112fd8d40ac7a787d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x435BE 19564 bytes

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