Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8be6defbfb0713c…

MALICIOUS

PDF

27.9 KB Created: 2013-01-29 13:45:06 Authoring application: bDdLHxK31 (via Fgh7EqgVcLT4AhMJ) First seen: 2013-09-29
MD5: 29e515a09fc877698a27e3283b4f2705 SHA-1: 157a4cc91b1fbb1d7dc5353df20cf80144787c85 SHA-256: f8be6defbfb0713c8a89e262510c722b99d660df910942aa013c1edc4a4b472c
72 Risk Score

Malware Insights

MITRE ATT&CK
T1555 Credentials from Password Stores T1059 Command and Scripting Interpreter

The PDF was flagged by an ML classifier as malicious and contains an embedded file. The embedded file, named 'embedded_file_obj0016.bin', is the primary indicator of malicious intent. The presence of XFA forms and duplicate object bodies are common characteristics of weaponized PDFs. The exact nature of the embedded file's payload is not discernible from static analysis alone, but its presence strongly suggests an attempt to deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9512

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Suspicious extracted artifact info 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 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/2.2/In PDF document text
    • http://fsf.org/&gtIn PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://ns.adobe.com/xfdf/In PDF document text
    • http://www.xfa.org/schema/xfa-form/2.8/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0016.bin pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x174F 28815 bytes
SHA-256: be0e68b5274d5f105c6822d4dc506da5b80462a8e5e34591137d3e56a1ae9ae4
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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