Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3aff3da508278a9…

MALICIOUS

PDF

29.9 KB First seen: 2015-09-16
MD5: 436fb80a1bfb6ea2898a66da4e9e8240 SHA-1: a1fa7e78d929c8154c7b4bbc0c45646438d1c518 SHA-256: a3aff3da508278a9db1ee8e1a84dfb4483bdae032b63adbdc0bda77505e45658
72 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: User Execution: Malicious Attachment T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter

The PDF file contains an embedded script payload, indicated by the 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristic. This suggests the document is designed to execute malicious code upon opening or interaction. The embedded file 'embedded_file_obj0054.bin' is likely the payload. The presence of XFA forms and embedded files points towards a delivery mechanism for further exploitation.

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
  • Embedded script payload in PDF stream info PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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/2.4/In PDF document text
    • http://www.xfa.org/schema/xfa-data/1.0/In PDF document text
    • http://ns.adobe.com/xtd/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_obj0054.bin pdf-embedded-file PDF EmbeddedFile object 54 at offset 0x45 29174 bytes
SHA-256: ef29f41e0218da49062f6d7484a7532b2e5aacf0e0ca7b353e1d568e9706bf7e
Detection
ClamAV: No threats found
Obfuscation or payload: likely
341 of 436 identifiers look randomly generated (e.g. 'lOFBWWYIJADDaDFGRWDOTPwLBKlEWFuQZXWPNQ4Y'); 1 string-concatenation chain(s) — consistent with name-mangling obfuscation. Carved artifact contains 53 long base64-like blob(s).

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