Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5bba65cbbcc4ae…

MALICIOUS

PDF

230.8 KB Created: 2010-08-12 12:45:42 -04:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Distiller 9.0.0 (Windows))
MD5: 0e22262666f0288c66c92500e9faaecf SHA-1: f33f66be127d73ce09a16f16d84ffa0170cdc653 SHA-256: cd5bba65cbbcc4ae5caf170b921852e0c436a38f1b3f8ec2cb43d661c5c7e76b
384 Risk Score

Malware Insights

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

The PDF file contains JavaScript and a launch action that exploits CVE-2010-1240 to execute cmd.exe. This command is designed to launch an embedded PE payload. The embedded executable was detected by ClamAV as Win.Trojan.Swrort-5710536-0, indicating a trojan downloader.

Heuristics 10

  • 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
  • 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\\cpi.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0090_000.js
0c0d2690339fbaa651b5e8ad0f7e9c2107e75161c0de3adf31fe349e3520e9f1		 pdf-javascript-stream PDF /JS object 90 at offset 0x395B2 52 bytes
stream_032_off0002e897.bin
43d3d0891e76b7d25875aa7cc2a31909411c1bd136fffcc3166cddd152504999		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E897 73802 bytes
Detection
ClamAV: Win.Trojan.Swrort-5710536-0
Obfuscation or payload: unlikely
icc_00_off00002408.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x2408 3144 bytes

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