Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d5268f8f841687…

MALICIOUS

PDF

12.0 KB
MD5: 9c6e3a207e2d61408d4c714cef1c967f SHA-1: 995665f305490e575c988d01d095d490b29b0682 SHA-256: 81d5268f8f8416875cb28f97a7dfb3495c551e6eb7051d56ab3d15d053f8613b
130 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Exploit.Dropped-90 and a machine learning classifier as malicious. It contains an embedded file and uses ASCIIHexDecode filters, indicating an attempt to obfuscate malicious content. The presence of an unknown URL suggests it is used to download a secondary payload, likely leading to client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Dropped-90 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-90
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://vaniz.ru/ItuBF21PNxyDGU84axtoFdbr84x4Dmbc?pp=1?plugin=1
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
6feef1bf69abc3f580b900f1443948190934def82e7ade1bf966fa5d654825be		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x5A 1874 bytes

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