Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79d1b2bef9a27fc…

MALICIOUS

PDF

184.3 KB Created: 2010-11-12 16:05:24 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))
MD5: 7e4b39b600d7969de3c3b458c1bace62 SHA-1: 94640bc9d8bac1d5e699ed995252f2d75b6bfb79 SHA-256: b79d1b2bef9a27fcfaa2515a9463a02fa8b9c2d8648d1cd0614e6902f13e11b2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The primary PDF contains embedded JavaScript and a RichMedia (Flash) object, indicating an attempt to exploit vulnerabilities. Critically, it also contains a secondary embedded PDF with suspicious static findings, suggesting a multi-stage attack. The ClamAV detection as Win.Trojan.Agent-36159 further supports the malicious nature of the file. The embedded artifacts and heuristics point towards a delivery mechanism for further malicious content.

Heuristics 7

  • 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.
  • ClamAV: Win.Trojan.Agent-36159 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36159
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (matched inside decoded stream)
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0027_00.bin
667b2c75ccf7ac530ab7ab1335ed88701c878c9bd33ce7626a853b18be32e7d1		 pdf-objstm-decoded PDF /ObjStm 27 0 obj (inflated) 1170 bytes
font_00_sfnt_off00021a56.bin
705655d5c76fbfc3c3df1f34447505d8348355dc80b0f07069bd2093ec27ca7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21A56 203108 bytes
polyglot_child_pdf_off00020a61.pdf
f8f3194608695c2b8b5579cd05d929f2d60de486f336026ddcf543fc0ac069a0		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x20A61 54997 bytes
polyglot_child_pdf_off0002c949.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x2C949 6125 bytes

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