Malicious PDF — malware analysis report

Static analysis result for SHA-256 4654ba3a91ec1db4…

MALICIOUS

PDF

80.9 KB Created: 2021-04-02 10:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: eda1ba54a91e503e687c5002645eda1e SHA-1: a5ed5e3103e55fa75a0b36ab75f4ad5707c24fc1 SHA-256: 4654ba3a91ec1db46a1a403071c423867d3bee3f4146e48d46e67f7e4664c1ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous external URLs suggest the document is designed to redirect users to potentially harmful content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://lozipotod.ru/award?keyword=plataformas+de+almacenamiento+en+la+nube+pdf PDF link annotation
    • http://ripugusulufiluj.getenjoyment.net/accelerate_book_download.pdfIn PDF document text
    • http://freehookup.xyz/lilidisozunudifada5z5z9.pdfIn PDF document text
    • http://islta.fun/rigakejobifidax8hjy.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/Bhaigii/70s_music_songs.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/siwuxujububazaribaraketoz.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/ifhdirU/tinelekedebekuxa.pdfIn PDF document text
    • http://job-finder.space/acer_aspire_e5_i7_review5uf3e.pdfIn PDF document text
    • http://republvinb.fun/76906369763r67h.pdfIn PDF document text
    • http://airned.ru/934160950789wbqy.pdfIn PDF document text
    • https://cdn.sqhk.co/matejedu/fXhb26P/ipcc_report_2007.pdfIn PDF document text
    • http://sqrab.top/haynes_jeep_wrangler_repair_manualigzrf.pdfIn PDF document text
    • http://kukushpa.fun/oral-b_professional_care_1000_electric_toothbrush_best_price7lwxe.pdfIn PDF document text
    • http://femaxewife.getenjoyment.net/jspdf_autotable_import_angular.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_2736ee1cc50340baa2c1af73fabd5d1c.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_62a1792cb0644a8f8408a3fe2a83dd13.pdf?index=trueIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_8a046fadcbf344d5acffca3daef83caf.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_0e3b2a8282334623954f04e495599a3d.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_7b94c9f10a944911b9f1cfa514f5117d.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_3d1d7549befc4045a7785745ceb9f17a.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 5444 bytes
SHA-256: 63f27e32cb1a4ad9d7989752f8c5c75103efa808af22770a115c1805fe1508be
font_01_sfnt_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 12248 bytes
SHA-256: 32240b83994375c2d54ac32b5ccceb23b10e1be6d1fc19dcef4051085067f6e8

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