Malicious PDF — malware analysis report

Static analysis result for SHA-256 413e536ceffd44ca…

MALICIOUS

PDF

101.5 KB Created: 2010-03-31 10:11:42 UTC Authoring application: Advanced PDF Repair: http://www.pdf-repair.com
MD5: 344c2fad4d6b7558eecab0d8d63185aa SHA-1: 72580dc4dccada26385576dfb4a6bdcb3e0d6a3e SHA-256: 413e536ceffd44cadedf19f0c361df2784e3cd8b447c320730518d5829ac2352
72 Risk Score

Malware Insights

MITRE ATT&CK
T1557 Adversary-in-the-Middle T1059.001 PowerShell

The PDF file contains an embedded script payload and an embedded file, both flagged as malicious by heuristics. The ML classifier strongly indicates maliciousness. The presence of an embedded file suggests an attempt to deliver a secondary payload. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • Embedded script payload in PDF stream medium 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.
  • 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.
  • 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.
  • 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://www.pdf-repair.com
    • http://www.pdf-repair.com)/Producer(Advanced
    • http://www.pdf-repair.com)/ModDate(D:20100406171120+08
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
374649ca9d248b513cf7adf1fbdefc499c0f5cf754334845fe32496ec9c2fa44		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x51 13412 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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