Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a7086a1396aa61…

MALICIOUS

PDF

233.2 KB First seen: 2015-10-13
MD5: bf04e51d9a3b6f75f7aced33d9c9e610 SHA-1: 248c9a7a00b88560bd5f5993a4fe7ff158b3f049 SHA-256: 56a7086a1396aa615c6f6502c155ac94473af478e7a7f0048df861a7ba62577d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The ML classifier strongly indicates this PDF is malicious. It contains an embedded file, which is a common technique for delivering second-stage malware. The document body is heavily obfuscated and unreadable, providing no direct clues about its intent beyond the technical indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • Suspicious extracted artifact medium 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 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://ns.adobe.com/xdp/ In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-template/2.4/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • https://ns.adobe.com/xtd/In PDF document text
    • https://www.xfa.org/schema/xfa-form/2.8/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x51 13433 bytes
SHA-256: dcfbde8e813d9d2742c2c50c2966407df809cedd9eb1ac0fa4025ad9147e7ffc
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).
xfa_image_rawvalue_000.tif pdf-xfa-image-tiff XFA image/rawValue TIFF payload near offset 0x587 8642 bytes
SHA-256: 3f6d3cfa3f1d381d19b7557ce05d06ccee54762f885919dbfcf9c6c5cca358d0
Detection
ClamAV: Win.Exploit.CVE_2010_0188-7
Obfuscation or payload: likely
Static shellcode analysis found candidate code region(s). Indicators: NOP sled

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