Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9a978464bd8dc6…

MALICIOUS

PDF

29.5 KB Created: 2020-04-18 19:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 38d89fba145250163488a2d979f920df SHA-1: 48752b6ac52904a0438e0ea16d851d86cb7fe606 SHA-256: 0d9a978464bd8dc6ecb77d515306db7a9b9b028e50b2b81fc090086d8fcde808
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the structure suggests an attempt to manipulate search engine results or distribute malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ecgcore.com/uploads/1/3/1/3/131383975/131383975.html#beamng+drive+original+cars
    • http://art-by-raquel.com/uploads/1/3/0/6/130621798/nekebiv-nofipevefijave.pdf
    • http://echoeducation.net/uploads/1/3/0/6/130639574/fufere.pdf
    • http://mtskhetaexpert.com/uploads/1/3/0/4/130475923/4650574.pdf
    • http://muplopets.com/uploads/1/3/0/6/130620691/korawik.pdf
    • http://powermoveswithnikkolopez.com/uploads/1/3/0/5/130540585/mepivurosoxo.pdf
    • http://redbarncountrymall.com/uploads/1/3/1/6/131637482/sometabawavil.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_off00004cb3.bin
d0f54284e74e39d7e011e8fa179c33752343e7add46f96af9c9ca07b9ab41946		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CB3 7624 bytes

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