Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df2a5217de9ec42…

MALICIOUS

PDF

12.1 KB
MD5: 808ddf6435cbb1edd423cbb3b37a6b93 SHA-1: 729b9ce9c90c2c27e8c2020238d66ccfa65777ce SHA-256: 5df2a5217de9ec424d1ee60b7f06d8dec302bdb0a45856e0129a51025c470183
130 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating it contains an exploit. The presence of an embedded file and the use of ASCIIHexDecode filter with exploit indicators suggest it's designed to drop and execute a secondary payload. The embedded URL is highly suspicious and likely points to the distribution point for this payload.

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://lchag.ru/cfmzzi4aoyjdsgclhv7zejmgks17obur?pp=1&x=700?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
31b0ef2157e389e21da944e7621bf5c9194ecb3884855292c3705ef13af6b111		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x5A 1880 bytes

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