Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b98ebba929a7c07…

MALICIOUS

PDF

46.4 KB Created: 2020-05-18 21:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7bc5092d6517207548c54b1ac60f560 SHA-1: 20603ae7ebc4be5b09ded7d4e3b1c780407a2e91 SHA-256: 5b98ebba929a7c07b5af1960f058ff57d5d072a6dc67cb037662d8ecc07f5a1b
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to websites that appear to be part of a link farm, indicated by the PDF_SEO_LINK_FARM heuristic. The document body also contains these URLs, suggesting the primary purpose is to direct users to these external sites. While no scripts were explicitly extracted, the nature of the link farm and the ML classification suggest a malicious intent, possibly to host further malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://riversidecountyhistory.org/uploads/1/3/1/1/131164100/131164100.html#hot+wheels+price+guide+treasure+hunt
    • http://smithjoyrealty.com/uploads/1/3/1/4/131483083/b9d04d0dd.pdf
    • http://gammaaudiosystems.com/uploads/1/3/0/8/130814292/wogazobim-pumigemudareri-nafajejoro-bafewasokuriti.pdf
    • http://a1urc.com/uploads/1/3/1/3/131384542/00fe84a5.pdf
    • http://artiart.store/uploads/1/3/0/3/130379458/rivasemub.pdf
    • http://ausalon.com/uploads/1/3/1/0/131070006/webopifefaxuwelolip.pdf
    • http://nokant.com/uploads/1/3/0/5/130546937/3100337.pdf
    • http://lotusliving.xyz/uploads/1/3/0/5/130551922/082fdca2501.pdf
    • http://storybrooksentertainment.com/uploads/1/3/1/3/131381891/numawabekabug_vokifagumax.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007243.bin
7e690757a54a4fdcc53ae6fda899daf0049985aa59a4887bb99043eb97912d73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7243 11216 bytes
font_01_sfnt_off0000990c.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x990C 16204 bytes

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