Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a6b07e143fdd87…

MALICIOUS

PDF

13.0 KB Created: 2010-07-30 03:03:35 Authoring application: PDF Editor  - Foxit Software
MD5: 3b8bd9b14c5f9aea082a2dc575958c76 SHA-1: ec6ddcebf4c9c989a7a91091ecd7f1bac42a2d1d SHA-256: 14a6b07e143fdd877c0a30d1755b52c23dca22e53f0b2679fc84e252652ee511
164 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV due to obfuscated objects and embedded files. The presence of embedded files and a remote GoTo action suggests an attempt to exploit vulnerabilities and potentially download further malicious content. The embedded files are likely part of the exploit chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

Heuristics 6

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • Remote GoTo action info PDF_GOTO_REMOTE
    PDF has GoToR/GoToE actions that reference sibling document files — typical of multi-part document bundles
  • 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.
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.4/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
c5ae70af712c8e1c1062f5f60f3942d60b5b44bedb2a3c82a124431c3545ec63		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x7E 13408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
u.pdf
5d409ce5281334d03fbca7cdb17e718d411bfb83ce8dd8df5568bbc8fa10ec91		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x431 10627 bytes
Detection
ClamAV: Heuristics.PDF.ObfuscatedNameObject
Obfuscation or payload: unlikely
ul.pdf
cd618b57f4ec9d895a15e420af4dba98dba25e4b24c21be6b63ab7bf78ccdbef		 pdf-embedded-file PDF EmbeddedFile object 11 at offset 0x489 12014 bytes
Detection
ClamAV: Heuristics.PDF.ObfuscatedNameObject
Obfuscation or payload: unlikely

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