Malicious PDF — malware analysis report

Static analysis result for SHA-256 829dc65f86597880…

MALICIOUS

PDF

103.2 KB Created: 2011-04-18 15:20:20 +08:00
MD5: 80212221b0730eeb1e7325e63133bcbb SHA-1: 3bd0b905b1afdbf2b1de2b9ae7dee66fd2db9d3e SHA-256: 829dc65f865978808d6dd81e374b16fe9a00a2613f91234f2c325073c26c490c
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains embedded files, including secondary PDFs, which is a common technique for delivering exploits or additional malicious content. The 'POLYGLOT_CHILD_PDF_STATIC_TRIAGE' heuristic firing with a high score indicates suspicious findings within these embedded PDFs. The presence of embedded rich media (Flash) further supports the malicious nature of the document.

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/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 3

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
polyglot_child_pdf_off0000c8fd.pdf
87e1c7839d82dd16e927d9471dc99583751e7b233352c2e6b19b59ed6f67363b		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xC8FD 54213 bytes
polyglot_child_pdf_off000184d5.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x184D5 6125 bytes

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