Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efd8c6060e069f7…

MALICIOUS

PDF

10.9 KB First seen: 2015-10-03
MD5: daabf6e19365b3f2bb7c69ff835340c0 SHA-1: c78f94b3e800d4274a4d629262a08d99c580a258 SHA-256: 5efd8c6060e069f70ca5cead642f69c670e4d654b1acdf1e10423207b950e47a
78 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains heuristics indicating a malformed active-content stream length, suggesting an exploit is present. The ML classifier strongly flags this PDF as malicious. While no explicit script was carved, the presence of XFA forms and embedded files points towards a potential exploit execution, likely involving JavaScript, to download further content from the unknown reputation URL http://testset.com.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://testset.com In PDF document text
    • http://www.xfa.org/schema/xfa-locale-set/2.1/In PDF document text
    • http://www.xfa.org/schema/xci/1.0/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0041.bin pdf-embedded-file PDF EmbeddedFile object 41 at offset 0xF47 66 bytes
SHA-256: 99ee8745c1014a04831bc8366443f3cd587d064326d62e02d6a5e5cb0012cb37
embedded_file_obj0042.bin pdf-embedded-file PDF EmbeddedFile object 42 at offset 0x10D7 1029 bytes
SHA-256: dda0835df994b8be920f715db36452f6cee7bb42bbc9c897f878a7b298ba8e91
embedded_file_obj99999.bin pdf-embedded-file PDF EmbeddedFile object 99999 at offset 0x12F3 2408 bytes
SHA-256: 218ced561cd5ce4743024065e5909fae7c0ef67fbab343efa4dc9a2fb44b565e
embedded_file_obj0044.bin pdf-embedded-file PDF EmbeddedFile object 44 at offset 0x23A4 144 bytes
SHA-256: 3dd68f00f4fcb366a2a3a17c65cb2626eeddf5ea5713302d374310561d810169
embedded_file_obj0045.bin pdf-embedded-file PDF EmbeddedFile object 45 at offset 0x2451 77 bytes
SHA-256: 10c03f88a5f0a0833dc5b2c8ac295b3a3c6f65e23889eb8cc1dc6fe29bf7f275

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