Malicious PDF — malware analysis report

Static analysis result for SHA-256 62c01ca53ab3b217…

MALICIOUS

PDF

770.3 KB Created: 2006-10-17 16:58:43 -04:00 Authoring application: Acrobat PDFMaker 7.0.5 for PowerPoint (via Acrobat Distiller 7.0.5 (Windows))
MD5: e5364116f8af6f9e3b545187382c714d SHA-1: 271abf18ea3c52604f9950a3fca8a967a14ea17c SHA-256: 62c01ca53ab3b2170732e4edfa66bce634fff3eb03fb75554485494e8c4439fa
524 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF file contains embedded JavaScript that triggers a launch action for cmd.exe. This command then executes a dropped Windows executable, disguised as 'ced.pdf', which was detected by ClamAV as Win.Trojan.Swrort-5710536-0. The embedded executable payload suggests an attempt to download and execute a second-stage payload from the URL http://dzupdates.com/init.exe.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 13

  • 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\\ced.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
  • Embedded attachment masquerades: declared document, content is windows-executable critical PDF_EMBEDDED_FILESPEC_CONTENT_MISMATCH
    An /EmbeddedFile attachment's declared filename extension or /Subtype MIME type contradicts the magic bytes of its decompressed content. The attachment is declared as a benign document or image but the bytes are an executable or executable-bearing archive. This is a deliberate deception used to hide droppers in PDF attachments and is a generic indicator of embed-and-drop weaponisation, independent of any specific CVE.
  • 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.
  • /Launch action paired with attachment-dropping JS API high PDF_LAUNCH_PLUS_DROPPER_JS
    PDF combines a /Launch action with a JavaScript API call that writes or opens an attached/external resource — the canonical shape of the CVE-2010-1240 /Launch + exportDataObject family. Benign PDFs do not pair these surfaces; the combination indicates a drop-and-execute chain regardless of the specific JS API knobs or /Launch target.
  • 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
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
  • 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://dzupdates.com/init.exe�hD�@
    • http://www.zeustech.net/
    • http://]hostname[:port]/path
    • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdfx/1.3/
    • http://www.apache.org/
    • https://www.verisign.com/repository/CPS��
    • https://www.verisign.com
    • https://www.verisign.com/repository/verisignlogo.gif0��
    • https://www.verisign.com/CPS0b
    • http://www.microsoft.com/typography
    • http://www.iec.ch
    • http://www.microsoft.com/truetype/0

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ced.pdf
188fd7eb834c7e2c358f1a84eaced806addce99bf17f81c28e840d60013d0497		 pdf-embedded-file PDF EmbeddedFile object 1071 at offset 0xB568F 73802 bytes
Detection
ClamAV: Win.Trojan.Swrort-5710536-0
Obfuscation or payload: unlikely
javascript_obj1072_000.js
a4527cc1fdf0d26f12bb2fe0948c7c454c869d8a0abd631b4bd45f7448c90ab5		 pdf-javascript-stream PDF /JS object 1072 at offset 0xC031B 52 bytes
stream_047_off0003c031.bin
02e7a1cd3cb713b67d5fb613e77dae10f891ed704a90a78563316dba7482d327		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3C031 2196750 bytes
stream_075_off0006fe73.bin
88962c124c889a9afc81db1bb9cdd464fc018820282aa66dc1d1fbc68fcd791a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6FE73 227475 bytes
stream_117_off000a37bf.bin
e3d61070527205c3519d8442f1124e1eefa986a82d58d20f5c894390de5958c7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA37BF 11340 bytes
icc_00_off00009136.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x9136 3144 bytes
font_01_sfnt_off000a587e.bin
f586a6b1003fc9ab19a46ae0e439f253ecb8ac287975a4518a44fa139ec97e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA587E 9688 bytes
font_02_sfnt_off000a72db.bin
e3545cdc948f0f5f5f14c82729ed93a0e975c7e6cd4fa24c5a88ef5cc3af6005		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA72DB 11888 bytes

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