Malicious PDF — malware analysis report

Static analysis result for SHA-256 57284d90d4db8019…

MALICIOUS

PDF

13.5 KB Authoring application: Wjzgpjsqfk Xeqgdieadpkqvind
MD5: 9f97ac83431175599ed6451ab8772c19 SHA-1: 8c07a802d7895bd99bb4dd2022310d5497deb333 SHA-256: 57284d90d4db8019e74fb4832c58e032bb90660471a03e4342e785e7d8087504
68 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains an embedded script payload and an embedded file, both flagged as suspicious. The ML classifier strongly indicates maliciousness. The embedded file, 'embedded_file_obj0008.bin', is likely the secondary payload. The presence of XFA forms and embedded scripts suggests an attempt to exploit PDF vulnerabilities for initial execution.

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.tallussafe.rr.nu/?vhzzzzu4=msvn3rff7Zma1tXQsqipk5qL6tzmt7CrpWnZk86fq6qqh9rYs5mtq7Cvp2aomJ6S4eawkpaVro7b3NzssobIrJLc3tewlIzYmg%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
2b61dc2831b5bcc866b55154412bb95ae9134637d800e54f8f7541fea1dbde37		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0x2EE 12756 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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