Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80576f241544e6f…

MALICIOUS

PDF

87.8 KB Created: 2020-09-03 07:22:23 UTC Authoring application: InvoiceHome.com
MD5: 57e89c28665801cb8448937e05dd89d5 SHA-1: 5a75811a2db79ad2108188a7d1c3377493383f9e SHA-256: a80576f241544e6fbd0a229b4d969f9934a77e8dc26f53b1243e7f639f28bcc6
404 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File Execution T1204.002 Malicious File Execution: Malicious PDF T1059 Command and Scripting Interpreter T1059.003 Command and Scripting Interpreter: Windows Command Shell T1071.001 Application Layer Protocol: Web Protocols

The PDF contains embedded JavaScript and a PE payload, and utilizes a launch action to execute cmd.exe. This chain of actions is designed to exploit CVE-2010-1240 to download and execute a secondary malicious payload, likely a trojan as indicated by ClamAV detections on the extracted artifact.

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
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
  • 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\\1002-Contoso.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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 2 image(s), only 0 text block(s), carries a click-outward action, and is only 87 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
  • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0037_000.js
d78cd5b9aa528cab6fd2fd311751f1344fe28967686d87d24e53d38144619b07		 pdf-javascript-stream PDF /JS object 37 at offset 0x15A86 61 bytes
stream_011_off0000ae75.bin
f436586c9c49e46a759d7fa07853b1d5c54ff6c42133db68bd03c97eef4ea997		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAE75 73802 bytes
Detection
ClamAV: Win.Trojan.MSShellcode-7
Obfuscation or payload: unlikely
font_00_sfnt_off00002ffe.bin
4d065b5f6759c8bf9d8995765b17f2ca97c9c3318b49ce21b9c6a0f1152d4f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FFE 33708 bytes
font_01_sfnt_off00008090.bin
eb742e72815c1d81b52ae6179adbeb6a74375e818462e918ab00747c0b4a5e80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8090 18564 bytes

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