Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c47f60d4c25b38f…

MALICIOUS

PDF

101.0 KB Created: 2013-04-06 00:51:42 +02:00 Authoring application: Acrobat PDFMaker 9.0 pour Word (via Acrobat Distiller 9.0.0 (Windows))
MD5: 817aedd06af4217ca328bc662b5e5de3 SHA-1: 938ed2662a37258db79bdb465bf6e32ba5ab5a78 SHA-256: 1c47f60d4c25b38f100a88521c11763215c8bf99ec00d94194a6566d1d0b84ec
68 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript with an eval() call, indicating obfuscated code execution. This script is likely responsible for downloading and executing a second-stage payload from the external URI. The presence of obfuscation and the nature of the embedded script suggest a malicious downloader. The document body was not sufficiently readable to determine a specific lure.

Heuristics 7

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Additional-actions dictionary low PDF_AA
    PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.aihus.fr/prod/data/publications/recherche/Wunsch-Sexo50.pdf
    • http://www.aihus.fr/prod/data/publications/recherche/Wunsch-Sexo48.pdf
    • http://recherche.ouvaton.org/telechargement/importance_croyances_dans_troubles_sexuels.pdf
    • http://recherche.ouvaton.org/telechargement/human_sexuality_neurobiology.pdf
    • http://recherche.ouvaton.org/telechargement/sexualite_humaine_neurobiologie.pdf
    • http://www.tandfonline.com/doi/abs/10.1080/15299716.2010.500960
    • http://tel.archives-ouvertes.fr/tel-00447422/fr/
    • http://www2.hu-berlin.de/sexology/BIB/FR/wunsch.htm
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_004.js
c45c2f56388042e0b1dd331396bde64874ed28d2724759829edee51a5e0dfd5b		 pdf-javascript-stream PDF /JS object 1 at offset 0xF 1558 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 eval/decoder/string-building token(s).
font_00_sfnt_off0000bfbe.bin
242fccdeac6e96523027d358363b63494c7ee4012b4ebc71e39254a01c217fa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBE 55892 bytes

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