Malicious PDF — malware analysis report

Static analysis result for SHA-256 492bf7b3c561db55…

MALICIOUS

PDF

82.5 KB Created: 2021-04-22 01:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 150cf92d6181e87a242af3d672e3363b SHA-1: dd298c18680d5b36066ed3eef5b2bef9ac3a173d SHA-256: 492bf7b3c561db5589390c39e93f59f4a52824571741c3510c25b57eb3309cd2
66 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 disposable hosting or redirectors, indicating a link farm designed to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of many external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://vilenefex.ru/strik?utm_term=how+much+does+a+isa+certified+arborist+make
    • http://tizezs.xyz/project_management_office_vs_program_management_office37f6u.pdf
    • http://helpverifybadges.com/rainbow_e_series_hepa_filterxuoau.pdf
    • http://ramedefinu.getenjoyment.net/architecture_house_plan_drawing.pdf
    • http://zofunubesosena.mypressonline.com/algorithms_illuminated_part_1.pdf
    • http://vuroxinizona.scienceontheweb.net/vokupigowuwinunorop.pdf
    • https://static.s123-cdn-static.com/uploads/4414696/normal_5ff2586630245.pdf
    • http://ejqy.com/what_are_the_6_purposes_of_writingaiptj.pdf
    • http://gisoboxizaza.mygamesonline.org/vimedukejapuwep.pdf
    • https://static.s123-cdn-static.com/uploads/4466679/normal_5ff81edf8f50a.pdf
    • https://cdn.sqhk.co/sututidogo/eAjgChf/sisejapunewikujodor.pdf
    • https://cdn-cms.f-static.net/uploads/4408330/normal_60183518d3a1f.pdf
    • https://cdn.sqhk.co/zezinojox/hghhhBC/15137432265.pdf
    • https://cdn.sqhk.co/nedabuke/hvdid19/63584919194.pdf
    • http://dotekebenutedex.scienceontheweb.net/budget_highlights_in_2020_20.pdf
    • https://cdn.sqhk.co/nuvexajamu/hjiaQb9/best_movie_quote_quiz_questions.pdf
    • http://lufosopaxukil.getenjoyment.net/advanced_swing_trading_strategies.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xuxerutiwuv.onlinewebshop.net/lingo_english_language_center_karachi.pdf
    • http://kovobopejuwego.rf.gd/how_much_do_first_officer_pilots_get_paid.pdf
    • http://vorawaforase.epizy.com/honda_odyssey_2019_manual.pdf
    • http://jopiliseduvorop.rf.gd/1996_ford_ranger_lug_pattern.pdf
    • http://xolavozezimodan.onlinewebshop.net/amparito_roca_aubrey_winter.pdf
    • http://sojufuka.atwebpages.com/juvosugajodo.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.

FilenameKindSourceSize
font_00_sfnt_off00010631.bin
f790b9ebd6fb121eb7f85683f6f30022e2ac559978237aef8bfb2796e67cce1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10631 5484 bytes
font_01_sfnt_off000118bd.bin
c3cf5a164d7f00d9e2de82bb026bb919de4c556015ef251d6b6c3c1ddb9a1c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118BD 10484 bytes

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