Malicious PDF — malware analysis report

Static analysis result for SHA-256 711092badc26d628…

MALICIOUS

PDF

12.0 KB
MD5: a79da4d42e070f140ce025171aff8897 SHA-1: 5734fecbe6151b0c3153776d7a9dd87181348168 SHA-256: 711092badc26d628caca50f0a5dcb92ea219f66bbee3c1f7f9c17d2361d32471
130 Risk Score

Malware Insights

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

The PDF file contains embedded exploit indicators and was flagged by ML classifiers and ClamAV as malicious. The presence of an embedded file and XFA form suggests an attempt to exploit vulnerabilities for client execution. The unknown URL is highly suspicious and likely serves as a download location for a secondary 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://shitd.ru/K7nElTi2hGcorkV8aMhT2FbmHCmvruA?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
de1c1229e32669fab2f1b0c2cf1b9fefbbbea3e025a3362803e2a29583c369fc		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x5A 1873 bytes

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