Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3c742fb4f75365…

MALICIOUS

PDF

136.7 KB Authoring application: Skia/PDF m117 Google Docs Renderer
MD5: e7a676f2f71eceb81701d74506ffb6e0 SHA-1: 6fc5adb1d7fa8ceba687942ad6040ede4b25d584 SHA-256: 4b3c742fb4f7536519f473360c1bb5a3af532864882ebd0dc59492bf198843c0
406 Risk Score

Malware Insights

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

The PDF contains a critical PDF_LAUNCH heuristic firing, indicating an attempt to execute a command-line tool, specifically cmd.exe. This is further supported by a critical PDF_EMBEDDED_PE_PAYLOAD firing, suggesting an embedded executable. The presence of a ClamAV detection for 'Pdf.Tool.Agent-1388586' and on an extracted artifact ('Win.Trojan.Swrort-5710536-0') confirms the malicious nature. The embedded URL 'https://shorturl.at/itRY5' is likely used to download or host the secondary payload.

Heuristics 12

  • 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\\TEST.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.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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
  • 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 https://ngrok.com/docs/getting-started/
    • https://tinyurl.com/bdpt5bpa
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • https://shorturl.at/itRY5

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0018_000.js
e988d501b3746cd0283465f607966eaea5929a780c0f7af214772ef47f632b6c		 pdf-javascript-stream PDF /JS object 18 at offset 0x20FF2 53 bytes
stream_004_off000162c5.bin
8041c9288f93b5dc949974b8a217e38702ad6ebb90bd6151d6e68242a2955cb1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x162C5 73802 bytes
Detection
ClamAV: Win.Trojan.Swrort-5710536-0
Obfuscation or payload: unlikely

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