Malicious PDF — malware analysis report

Static analysis result for SHA-256 718ed0b195d54a63…

MALICIOUS

PDF

36.0 KB Created: 2020-04-06 05:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fdad285a1b3f731a4cba531b7cf83e25 SHA-1: 7f0cf8a90e5a9e440a45850ea2ac2a69a249da9a SHA-256: 718ed0b195d54a63112b37ea529a38afc9886668c7cd715e721621ca9ce5564f
96 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts a large number of external links to other PDFs. The embedded URLs and document body text point to a collection of domains, each hosting PDF files with numeric slugs. This suggests a coordinated effort to manipulate search engine results or distribute malicious content through these linked PDFs. No scripts were extracted, but the structure and external links are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mattsholly.com/uploads/1/3/0/5/130547924/130547924.html#voleibol+voleo+alto+concepto
    • http://migeorgeson.com/uploads/1/3/0/8/130813852/2954aa81e6.pdf
    • http://edgelg.com/uploads/1/3/1/3/131398259/7733996.pdf
    • http://gearuplp.com/uploads/1/3/0/6/130621495/sutul.pdf
    • http://humblebre.com/uploads/1/3/1/3/131381605/0705ae1d.pdf
    • http://astwoodinvestments.com/uploads/1/3/1/1/131164266/gajosulik.pdf
    • http://mondelice.org/uploads/1/3/0/4/130476204/rusixuwadese.pdf
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006154.bin
8aef42ea74a8789540e22423c2f0ad05b3f8d14cd23ff0a4c8c7f7bc832066cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6154 9072 bytes

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