Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95289846fb432a7…

MALICIOUS

PDF

267.6 KB Created: 2010-06-29 10:30:35 +08:00 Authoring application: pdfFactory Pro www.fineprint.cn (via pdfFactory Pro 2.53 (Windows XP Professional Chinese))
MD5: fb3ef5160f72adcf1b1c75972d96cb2b SHA-1: 28b14100efc0e2eef6a353e3ceed2361b3c0655f SHA-256: a95289846fb432a7470ebb8b6ea36d1d08d7bd34661e305e4eedb5b1a3fc3b26
218 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, detecting it as Win.Trojan.Agent-36159. It contains embedded JavaScript and a rich media (Flash) object, indicating an attempt to exploit vulnerabilities. The presence of an embedded PDF and suspicious static findings within it further suggest a multi-stage attack. The primary URL associated with the document's origin, http://www.fineprint.cn, is noted but has an unknown reputation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 9

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/xap/1.0/sType/ResourceRef#
    • http://adobe.com/AS3/2006/builtin
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_011_off00040b00.bin
50a053206d85c622062389d3a0c86603ef19af8c58b2cd6a12c9a805c70d26bf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x40B00 419 bytes
objstm_0017_00.bin
dd7918c182d6e2b8d996a6b8ee81663c49a0cb297efe1e1fa3c5af0c987bde84		 pdf-objstm-decoded PDF /ObjStm 17 0 obj (inflated) 871 bytes
font_00_sfnt_off00040c76.bin
da221eaf9c0703b15f52b4a6970fa71a439df3d18f75c8d84d8a42bde6044dfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x40C76 3200 bytes
polyglot_child_pdf_off0003fb02.pdf
c47c4c4cd061f300426db998205066483446e6d505344abd55292cb50df88291		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3FB02 13136 bytes
polyglot_child_pdf_off00041665.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x41665 6125 bytes

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