Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f7b2432c9dc6e04…

MALICIOUS

PDF

166.3 KB Created: 2011-04-18 15:20:20 +08:00 Authoring application: Writer (via OpenOffice.org 2.2)
MD5: 9ead2b29d633bdac3b2cd4a16b2629a2 SHA-1: c5bb1129349ed20f7f7147743f19da381f447cac SHA-256: 9f7b2432c9dc6e049f649d2d395ef2aded27c75265bdff84e1ae00eea8dab34d
138 Risk Score

Malware Insights

MITRE ATT&CK
T1559.002 Component Object Model Hijacking T1190 Exploit Public-Facing Application

The PDF exhibits multiple high-severity heuristic firings, including the presence of embedded Flash and a secondary embedded PDF. The ML classifier also flagged it as malicious. The embedded artifacts and the polyglot nature suggest an attempt to exploit vulnerabilities or deliver a second-stage payload. The benign URLs found are likely standard PDF metadata and do not indicate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8693

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.
  • 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)
  • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0026_00.bin
0841ed6ca2149b386133777ff3868f6222ba5033d6f52cd654a117610818bd40		 pdf-objstm-decoded PDF /ObjStm 26 0 obj (inflated) 1084 bytes
font_00_sfnt_off0001b260.bin
b56b8d7a367860711a6a76dbcae17c986afab479071b06d3260b329d18b3f496		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B260 78108 bytes
font_01_sfnt_off0002518a.bin
e365214380728050acac64ca506ce77a3e68036e5995436ae49783742d09a9e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2518A 21596 bytes
polyglot_child_pdf_off0000b901.pdf
3a4ca12a44afc08415ef0a8b63a39fa8ba73b489d8922a2029caab146d691190		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xB901 122898 bytes
polyglot_child_pdf_off00028126.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x28126 6125 bytes

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