Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf39aa5ede7890b…

MALICIOUS

PDF

36.2 KB Created: 2020-05-29 18:40:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6a32670ff9ba2381a60b6f8054c6d04 SHA-1: d8dfd88b8701c590e440a054a827b1734293b99a SHA-256: 0bf39aa5ede7890b0e232bd7c8d2553e823961ba38cded3238252f76f850bff2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, identified as a link farm, with the apparent intent of directing users to download files. The document body, though heavily obfuscated, contains text related to downloading football matches, suggesting a lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.
  • 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://xianshanghongtaokyulecheng.br3h.com/uploads/1/3/0/8/130813966/130813966.html#descargar+partidos+de+futbol+complet
    • http://puppiessavedemocracy.com/uploads/1/3/0/8/130874437/nikufuzusepojamaref.pdf
    • http://coastalcottages2go.com/uploads/1/3/0/9/130969384/8109307.pdf
    • http://szkoleniaicoaching.com/uploads/1/3/0/2/130291635/kuxujixil.pdf
    • http://kindanimalservices.com/uploads/1/3/0/7/130776616/tepukekite.pdf
    • http://tinaking.pink/uploads/1/3/1/6/131637308/dobujebakas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f5d.bin
81bd4eba1c5c333b937c4edb63eaf4406314a5558923b0c890fd6f72441e9064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5D 11584 bytes

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