Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6328d957ba74e7…

MALICIOUS

PDF

1.2 KB
MD5: 8121a505f787fbdb938448a5aa19a0e2 SHA-1: 44be6ae2ad6f3c70c8d282c1ed250abbb7fe29fd SHA-256: ba6328d957ba74e724a796c55a9d6c6f245a0d6d82236936b1843bcf53226893
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains embedded JavaScript that is automatically executed upon opening, as indicated by the PDF_OPENACTION_JS_SUBMITFORM heuristic. This script is designed to submit form data to the URL http://guru.phishing.guru/XcmVijaXBpZWd50X2lkPTKMyMjY3MXMDI1qNSZjYW1wmYWTlnbl9ydW5faWQ9OTk4LMjc2JmFjdGlvbj1hdHRhY2htZW50#FDF. The document body further instructs the user to allow this action for decryption, suggesting a social engineering lure. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF auto-runs JavaScript form submission on open critical PDF_OPENACTION_JS_SUBMITFORM
    PDF uses /OpenAction to run JavaScript that calls submitForm() with an external HTTP(S) URL. Opening the document triggers the outbound submission path without requiring a normal link click.
  • ClamAV: Pdf.Dropper.Agent-7216932-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7216932-0
  • 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 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://guru.phishing.guru/XcmVijaXBpZWd50X2lkPTKMyMjY3MXMDI1qNSZjYW1wmYWTlnbl9ydW5faWQ9OTk4LMjc2JmFjdGlvbj1hdHRhY2htZW50#FDF

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
6384b47624eae09d43415619184838aeef8824690b5872aee4e819e1f79a4ab3		 pdf-javascript-stream PDF /JS object 7 at offset 0x30D 145 bytes
javascript_obj0007_001.js
2ce87f70afe515fc51d4004c7091b84e53ab11d8702106e6801d3701b363a8bc		 pdf-javascript-stream PDF /JS object 7 at offset 0x30D 143 bytes

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