Malicious PDF — malware analysis report

Static analysis result for SHA-256 29adff82c47cceff…

MALICIOUS

PDF

172.0 KB Created: 2011-04-18 15:20:20 +08:00 Authoring application: Microsoft® Office Word 2007
MD5: 3ab8d6848f30c327928411e5e9946eac SHA-1: 51b2712af7b956fa9bfe68683db8a37e2e63c160 SHA-256: 29adff82c47cceff9f30ed34a91b3b9d705df7236c30515e08e75f6da712b1b9
148 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.002 Phishing: Spearphishing Attachment T1190 Exploit Public-Facing Application

The file is a PDF containing embedded content, including a Flash object and a TrueType font, which are indicators of exploit attempts. The presence of PDF_CVE_2023_26369_RELATED and POLYGLOT_CHILD_PDF_STATIC_TRIAGE heuristics strongly suggests exploitation of a known PDF vulnerability. The embedded URLs are benign, but the overall structure points to a malicious document designed to exploit a viewer. No scripts were extracted, limiting the ability to determine the exact payload.

Heuristics 5

  • TrueType bitmap font + active content — CVE-2023-26369 related high CVE related PDF_CVE_2023_26369_RELATED
    PDF embeds a TrueType font with bitmap tables (EBDT/sbix/CBDT) alongside exploit delivery indicators — CVE-2023-26369 exploits the sfac_GetSbitBitmap function in Adobe's libCoolType for arbitrary code execution. This CVE was actively exploited in the wild, but this rule does not validate the malformed EBLC/EBDT primitive.
  • 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 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_off0000c901.pdf
19e83fab549d04b9d50ef4f1b043a4c5ed75ced9272afbd833d82f06e456f674		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xC901 124647 bytes
polyglot_child_pdf_off000297fb.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x297FB 6125 bytes

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