Malicious PDF — malware analysis report

Static analysis result for SHA-256 69be435c68b674dd…

MALICIOUS

PDF

350.6 KB Created: 2010-09-20 10:36:57 +08:00 Authoring application: easyPDF SDK 6.0 (via BCL easyPDF 6.02 (0342))
MD5: 6c0e4505193b6b74525ef3ab1d8dbda7 SHA-1: 164543e52a88025d0129aee7056dbe298fed0598 SHA-256: 69be435c68b674ddad59d2e2e0f51dc821c589efdf21c0aecf4b0d02d00a93d2
142 Risk Score

Malware Insights

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

The PDF contains embedded files, including a secondary PDF, which is flagged as suspicious by multiple heuristics. The ML classifier also strongly indicates maliciousness. This suggests the primary PDF is a container for delivering a malicious secondary PDF, likely exploiting a vulnerability for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 5

  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • 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 http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0017_00.bin
c515a5551a72a8497045fc7510d95c5a1a4edc56f02c0e8a1e04fb3285830168		 pdf-objstm-decoded PDF /ObjStm 17 0 obj (inflated) 1038 bytes
polyglot_child_pdf_off0003ab76.pdf
3c3070e939f61809f2ca536a894ac6d4f5b2626ae9e83473a6429009550f71f6		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3AB76 118494 bytes
polyglot_child_pdf_off00056267.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x56267 6125 bytes

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