Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb33fa5931867290…

MALICIOUS

PDF

111.9 KB Created: 2010-11-12 16:05:24 +08:00 Authoring application: pdfFactory Pro www.fineprint.cn (via pdfFactory Pro 2.53 (Windows XP Professional Chinese))
MD5: 569cb0a9f22e21a03946246206094bc3 SHA-1: eb3802511d3dc9c41455526835ca5fe43d2f47e9 SHA-256: cb33fa5931867290dd59c9b986ecc05ec013939f43f806b81a62f4db00112549
186 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and a secondary embedded PDF, both of which are flagged as suspicious. The ClamAV detection of 'Win.Trojan.Agent-36159' strongly suggests malicious intent. The embedded JavaScript likely facilitates the download and execution of a secondary-stage payload, contributing to the overall malicious nature of the document.

Heuristics 8

  • 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)
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.fineprint.cn
    • 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
stream_012_off00019c5f.bin
50a053206d85c622062389d3a0c86603ef19af8c58b2cd6a12c9a805c70d26bf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19C5F 419 bytes
objstm_0027_00.bin
667b2c75ccf7ac530ab7ab1335ed88701c878c9bd33ce7626a853b18be32e7d1		 pdf-objstm-decoded PDF /ObjStm 27 0 obj (inflated) 1170 bytes
font_00_sfnt_off00019dd5.bin
da221eaf9c0703b15f52b4a6970fa71a439df3d18f75c8d84d8a42bde6044dfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19DD5 3200 bytes
polyglot_child_pdf_off00018c61.pdf
c47c4c4cd061f300426db998205066483446e6d505344abd55292cb50df88291		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x18C61 13136 bytes
polyglot_child_pdf_off0001a7c4.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1A7C4 6125 bytes

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