Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2616939be385fde…

MALICIOUS

PDF

73.9 KB Created: 2021-04-02 05:18:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c244a9e31c888355bfa2a487c991ec7e SHA-1: d7458b01700b3351c108e3ba88d04403b99130de SHA-256: c2616939be385fdeee533ba15355378bbb71122dad3c96ae15357799f657cd28
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many of which are on disposable domains, and a heuristic identified a 'download button' lure. The primary malicious URL identified is https://jottigo.ru/strik?utm_term=1-99+crafting+osrs+fast, which likely serves as a redirector or hosts a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/strik?utm_term=1-99+crafting+osrs+fast PDF link annotation
    • https://cdn.sqhk.co/fetedudi/mjjifig/the_eight_planets_in_order_from_the_sun.pdfIn PDF document text
    • http://xemumuwob.22web.org/zirurozebemadumasivo.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/zgeihJv/zombie_road_trip_trials.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/idXdieX/19877051750.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/does_walmart_have_black_friday_deals.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/how_to_use_the_polder_thermometer.pdfIn PDF document text
    • http://jitutirujemi.22web.org/kuguzawezo.pdfIn PDF document text
    • https://cdn.sqhk.co/nomevagume/jiHGnhg/26545956297.pdfIn PDF document text
    • http://xedeporib.medianewsonline.com/the_house_with_a_clock_in_its_walls_2018_trailer.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/glencoe_mcgraw_hill_algebra_1_workbook.pdfIn PDF document text
    • http://zobotalemogi.sportsontheweb.net/center_point_scope_4x32_price.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/proficy_machine_edition_9.50_sim.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/65AOugg/69657028157.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://malebowepapin.epizy.com/piwosunejebukotitemedof.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_b42f1311b6cc4daa9f919daddba7dcf1.pdf?index=trueIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_4c1851ab98df4f66be92a655abe467ce.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_3e04a5448e2947ac9b5e1a02eec236b8.pdf?index=trueIn PDF document text
    • https://66f9544f-8325-470d-a543-c07714603334.filesusr.com/ugd/4b2642_4bcf9f5017a64643b1dd89b5d1afaa47.pdf?index=trueIn PDF document text
    • http://sidepojedava.myartsonline.com/expository_bible_study_outlines.pdfIn PDF document text
    • http://pudubekij.epizy.com/possessivpronomen_tabelle_deutsch.pdfIn PDF document text
    • https://c1908cc8-b41e-4b5b-ab1c-53d28a7f2745.filesusr.com/ugd/913720_961e1d34a8954085ae84099fe8466ba4.pdf?index=trueIn PDF document text
    • https://b81f28a7-a6cc-4df9-aebb-a76b708ee4b5.filesusr.com/ugd/df05b2_7845159fc8be44a18d6aaaddb4910a22.pdf?index=trueIn PDF document text
    • http://zugagib.atwebpages.com/10810387067.pdfIn PDF document text
    • https://7054f9d6-44ea-4b6c-8535-0d04e7cb9957.filesusr.com/ugd/963b03_19bd99ffe0564add8e047d699664ea15.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 5164 bytes
SHA-256: 6a910afd0999ee548ef5ef34510267bbbcdab21e9282be91962e397d4856a57c
font_01_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 11312 bytes
SHA-256: bf08677d5cd95dadbb7179f9c13d1b16fe37faacf1e020309632a25e4056afaa