Malicious PDF — malware analysis report

Static analysis result for SHA-256 de44751eeb322485…

MALICIOUS

PDF

15.5 KB
MD5: 1ffddf972630503c85b4daa013d56400 SHA-1: c582100166a8081239e80215c56d8c9123f95068 SHA-256: de44751eeb3224853b42f7de623e4babb2249f5c4ed28f60d088bd50cf0abfa2
118 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is a PDF document flagged by ClamAV as Pdf.Exploit.Agent-36962 and a machine learning classifier with high confidence. It contains an embedded file and an XFA form, indicating it is likely designed to exploit a vulnerability within the PDF reader to execute a malicious payload. The embedded URL is likely part of the exploit chain.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Exploit.Agent-36962 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36962
  • 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
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. 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://www.xfa.org/schema/xfa-locale-set/2.1/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0041.bin
d819f8080a23c6762f37d1d445e5ec8e09cba44614d565c2ef91e91f5c10138e		 pdf-embedded-file PDF EmbeddedFile object 41 at offset 0x2E66 89 bytes
embedded_file_obj0042.bin
dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91		 pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x2F18 1029 bytes
embedded_file_obj0044.bin
3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169		 pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x3689 144 bytes
embedded_file_obj0045.bin
10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275		 pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x3735 77 bytes

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