PDF malware analysis — malicious · f999740604ebc002

MALICIOUS

PDF

79.1 KB Created: 2021-04-09 03:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 9ec62aa64bfd80e88b74d073fd6de14d SHA-1: 2748a6e94b151d0d37fdb3a8fd529757f35a9902 SHA-256: f999740604ebc0027769e2d016bf012a855bfd4daa32b34d377f66ad2a3bde82

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to link farms or potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier also flagged the document as malicious with high confidence. While no scripts were explicitly extracted, the structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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 https://jacksth.ru/strik?utm_term=librecad+download+linux
- https://rulipativix.weebly.com/uploads/1/3/1/6/131607363/0ac446d.pdf
- http://pefumaviba.22web.org/cyberpunk_2077_gameplay_ps4.pdf
- http://shopsupergood.site/how_does_the_mist_book_endz0rib.pdf
- http://xajoraxi.22web.org/sql_server_database_engine_2017.pdf
- https://nevozijefase.weebly.com/uploads/1/3/4/7/134748823/702be0e62d194e.pdf
- https://cdn-cms.f-static.net/uploads/4373509/normal_60127a1f1793b.pdf
- https://tilawifi.weebly.com/uploads/1/3/4/4/134480999/ca7211d35d.pdf
- http://mapenibo.scienceontheweb.net/xipafajomiwofipa.pdf
- https://cdn-cms.f-static.net/uploads/4421940/normal_60622937788c0.pdf
- http://rufawefojag.sportsontheweb.net/kegagoparakavupuxejob.pdf
- https://cdn-cms.f-static.net/uploads/4481830/normal_6017400032fb4.pdf
- http://hustlinmoney.com/nogafeti70b8f.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/tawosutosuxi/jizujolakapadovivojosawit.pdf
- https://s3.amazonaws.com/kovezux/brittany_renner_judge_this_cover_book.pdf
- https://s3.amazonaws.com/wixamupelinere/30467497482.pdf
- https://s3.amazonaws.com/sulasatevirexo/15748204340.pdf
- https://s3.amazonaws.com/jazofi/company_annual_plan_template.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f8c4.bin` `f80cd43a402a3a1e71d2dfc0d741cbe6a0e00c8a811b9571f5eb96c79f0feb3e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8C4	4996 bytes
`font_01_sfnt_off000109e9.bin` `5c45e701843b27edd3215a940bd0d264d5d2d47773450481579aeb54a4263a97`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x109E9	11012 bytes

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