Malicious PDF — malware analysis report

Static analysis result for SHA-256 4451f7eced6315de…

MALICIOUS

PDF

56.8 KB Created: 2025-05-11 08:13:29 +01:00 Authoring application: mPDF 6.0 First seen: 2026-06-12
MD5: 78013a3d1fe9f6634f9520d67070e7c2 SHA-1: 33290746b18a98db3f88c5b96df17ce33bb85129 SHA-256: 4451f7eced6315deb37f2aa7203a1fcbb3fb41e5836f6a7d55bfe0b1f0ff4e22
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded URLs and exhibits characteristics of a fake invoice lure. The critical heuristic 'POLYGLOT_CHILD_PDF_STATIC_TRIAGE' indicates a secondary embedded PDF with suspicious findings, including external URIs. The document body, though partially corrupted, contains URLs that are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier clean score 0.0019

Heuristics 4

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://coachhire.com.au/confirm-order?qid=VFdwQmVVNVRNSGRPVXpCNFRWRTlQUT09Zkh4WlRFTlRVREF4TkRBeU5qazE= PDF link annotation
    • https://coachhire.com.au/pdf_invoice.php?id=RWNtSm91bmV5fHw0MDI2OTU=&v=1746947609In PDF document text
    • https://coachhire.com.au/termsIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000021f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F0 26192 bytes
SHA-256: 1a56ba1bf68f5240c6fa883f21c292901726c565d1d1da1bfb83f303f88bca2e
font_01_sfnt_off000058fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58FC 27040 bytes
SHA-256: f02f0deeae9fc99e362302984d4b819ab41692b4540fcdc15039675d31c72694
polyglot_child_pdf_off0000000f.pdf polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xF 58170 bytes
SHA-256: e226691dd8e2dc120138523061e2854a78149f65c21adaa02d78ed3db3f22934

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