Malicious PDF — malware analysis report

Static analysis result for SHA-256 243a02cdfeffd41e…

MALICIOUS

PDF

332.3 KB Created: 2013-09-11 15:33:44 +03:00 Authoring application: Microsoft® Office Word 2007
MD5: 5131633219c4803d27f8cf6dbe0b2680 SHA-1: d6570d7c897ef65aaffa6cf90608cdefefa685db SHA-256: 243a02cdfeffd41ec8d0e091060ed77b0656cd9d4d721d827c54b4bc5e6e16cf
388 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF file contains embedded JavaScript and a launch action that targets cmd.exe, indicating an attempt to execute arbitrary commands. A critical heuristic identified a hidden ZIP payload containing 'start.bat', which is likely responsible for deploying the embedded Windows executable payload. This chain of actions is consistent with a dropper malware designed to download and execute further malicious content.

Heuristics 11

  • Adobe Reader Launch action command execution critical CVE exact CVE_2010_1240
    PDF uses the Adobe Reader/Acrobat Launch action pattern associated with CVE-2010-1240: cmd.exe is invoked with attacker-controlled parameters, paired with an embedded/exported payload.
  • Launch action critical PDF_LAUNCH
    PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
  • Hidden ZIP payload with executable entries inside PDF stream critical PDF_HIDDEN_ZIP_EXECUTABLE_PAYLOAD
    PDF stream bytes contain an embedded ZIP archive whose local headers name executable payload files. This is not a normal PDF attachment (/EmbeddedFile); it hides Windows payloads inside an ordinary stream, a strong malware-loader or smuggling pattern.
  • Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD
    PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
  • /Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND
    PDF /Launch action specifies an executable target with parameters '/Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\\LTKalba.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • ClamAV: Pdf.Dropper.Agent-7239825-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7239825-0
  • 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.
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser exited 1. 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/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0448_000.js
54b3e3a0a63d8c1f0adde6d861fc4c511df62c5e30b8ec0eca17463f4acc9795		 pdf-javascript-stream PDF /JS object 448 at offset 0x52A79 56 bytes
stream_015_off0004996d.bin
5aa2ddb1b6700fe934a6a4912ffb84d405a41fd3c758e55719c6298ab6dc5986		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4996D 86507 bytes
hidden_pdf_zip_off0005e76d.zip
4d3abed8785b2280880d8611ddd7b5040f5d16c760a7f5f9280bea69b88f4b19		 pdf-hidden-zip PDF decompressed stream ZIP payload at offset 0x5E76D 1003 bytes

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