Malicious PDF — malware analysis report

Static analysis result for SHA-256 c522c838b3355a37…

MALICIOUS

PDF

9.9 KB Authoring application: Mkwqdhlpulw Ykwmewmkl
MD5: 2bcd5cfadff26edb26bd2da93e750cf3 SHA-1: 1b67851c1b9f3184fc7f3e868ebff77a636a6c84 SHA-256: c522c838b3355a37ddf75b2538293e95d398300d9ac9e758caa858e477bca187
70 Risk Score

Malware Insights

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

The PDF file contains embedded script content and is flagged by a machine learning classifier as malicious. The embedded script is obfuscated but appears to be designed to download and execute a second-stage payload from the provided URL. The presence of an embedded file further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://www1.thebesthwr-cleaner.uni.me/?9qui=XdTizbHN3ceL6N3MtKdkmqGL1eLRr5%2BiqZ7Xm8iamajWjuvlapSfl5qhlaJxqK2P4Nuik5WjrI7Y1I%2FVqbe1uYviotWynJrbiQ%3D%3D&quot
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0008.bin
8aed5c7faad5aeda5a61050fb1bcbee6a915e1dcf85b641c8fd37d9c7365104f		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x227 9075 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 long base64-like blob(s).

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