Malicious PDF — malware analysis report

Static analysis result for SHA-256 24aa5f96c99ee441…

MALICIOUS

PDF

71.2 KB Created: 2017-04-11 12:25:18 +03:00 Authoring application: iTextSharp’ 5.5.10 ©2000-2016 iText Group NV (AGPL-version)
MD5: 4bca9eaf8e6ef5697d2fd28f49fd7b92 SHA-1: 9b58654fe470035c37a1fe3747c03eab7e2c2382 SHA-256: 24aa5f96c99ee4419ede5a701c6e8534cb3b4e596f1daa52cf062ebce951ef86
174 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious. ClamAV identified it as 'Pdf.Dropper.Agent-6299168-0', and an extracted artifact was detected as 'Doc.Downloader.Donoff-10030369-0'. The presence of embedded JavaScript and an embedded file suggests the PDF is designed to act as a dropper for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-6299168-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-6299168-0
  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
20170406902382.docm
091ecdbfcc9a1c67d6e23874a3f0a74ea7d404740abd83eef28d5a5f31b5167e		 pdf-embedded-file PDF EmbeddedFile object 3 at offset 0x61 78383 bytes
Detection
ClamAV: Doc.Downloader.Donoff-10030369-0
Obfuscation or payload: unlikely
javascript_obj0005_000.js
d4ebbf193099e4997615ca3c37b8722dc0483a89f0b3aabd526e201bab5d6c26		 pdf-javascript-stream PDF /JS object 5 at offset 0x11762 103 bytes

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