Malicious PDF — malware analysis report

Static analysis result for SHA-256 db743a540f18556d…

MALICIOUS

PDF

56.0 KB Created: 2011-04-18 15:20:20 +08:00 Authoring application: KMBT_600 (via KONICA MINOLTA bizhub 600)
MD5: 737b018933379b1b9e1e4aac286ecf7a SHA-1: c5e6658d0281a945cfb418668ac27842ff8fd305 SHA-256: db743a540f18556d67e51c96c1af646f4f140b5886a6ec991f4e4207b689f2b3
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF file exhibits characteristics of a lure, specifically by containing an embedded PDF. The 'PDF_IMAGE_ONLY_LURE' and 'POLYGLOT_CHILD_PDF_STATIC_TRIAGE' heuristics indicate that the primary PDF is designed to present images and hides a secondary, suspicious PDF. This suggests an attempt to bypass initial detection or to present a deceptive interface to the user. The benign URLs extracted are likely unrelated to the malicious functionality.

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.
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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_off0000a109.pdf
75d662cf8b032e12ec6c4c93e7adf73e92f30b95dd433c0d77fdceb6e15f9909		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xA109 16163 bytes
polyglot_child_pdf_off0000c83f.pdf
4b16dada1ca3275de53ef776759c2486baa73e7c85f2f3490d9ca38a9466d91f		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xC83F 6125 bytes

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