Malicious PDF — malware analysis report

Static analysis result for SHA-256 f406f36644262945…

MALICIOUS

PDF

59.1 KB
MD5: 5897aba87b7668921a080141e8d2450d SHA-1: c66dd84a3ff40452c7416e6db06ca91f1f7a3575 SHA-256: f406f36644262945f659030e74b2ee9fc6441573fb025e96131e2689cb930dea
188 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The PDF file contains embedded JavaScript and RichMedia (Flash) content, as indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA heuristics. ClamAV detection confirms the presence of a known exploit kit (Swf.Exploit.Kit-513) within an embedded SWF file named 'redhidden-.swf'. This suggests the PDF is designed to exploit Flash Player vulnerabilities to download and execute further malicious content.

Heuristics 8

  • ClamAV: Swf.Exploit.Kit-513 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Swf.Exploit.Kit-513
  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
redhidden-.swf
82959a74bd2f365dbaff0af8a126e8d6efed63f658723f179f7020ea3628ed8b		 pdf-embedded-file PDF EmbeddedFile object 23 at offset 0xBFF 27931 bytes
Detection
ClamAV: Swf.Exploit.Kit-513
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
javascript_obj0013_000.js
be8f789640174e8e60ee653dfa3d82f2de862b565a6d6346df14e3fb06541aa0		 pdf-javascript-stream PDF /JS object 13 at offset 0x788 232 bytes
stream_003_off0000060b.js
61cb7867b5300981a8754a1a5c72bef9bf1e7764c02d9d7abd8c2f8f8bcb25c1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x60B 500 bytes

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