Malicious PDF — malware analysis report

Static analysis result for SHA-256 286e35737ab22a5e…

MALICIOUS

PDF

80.6 KB Created: 2021-03-18 03:45:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d2753ea0b040064ad41c6940dde33224 SHA-1: eb70f8c7dd1a88aca6b9b5b32edbb9dc4a2153cd SHA-256: 286e35737ab22a5eec5be54974367518200507e8372f732721409d2c7aa8ddf7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of redirects. The primary malicious URL identified is https://midufefew.ru/strik?utm_term=hp+officejet+4622+not+printing, which likely serves as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://midufefew.ru/strik?utm_term=hp+officejet+4622+not+printing PDF link annotation
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/xotepitu_romojopexuvuxer_bewaxiwovos_ruxozujow.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/4Uid9jg/nasogivipujazowanon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413007/normal_60352d6da8b87.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/kia53tG/14278109846.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380528/normal_5fc92df2616a8.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/the_other_side_of_midnight_movie_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/ilwzB1X/stockyards_fort_worth_events.pdfIn PDF document text
    • https://xemegejimeje.weebly.com/uploads/1/3/1/6/131636808/fotakamuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/ihfhadE/most_listened_gospel_songs_2020.pdfIn PDF document text
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/e8d0544.pdfIn PDF document text
    • https://mesopivupezuna.weebly.com/uploads/1/3/5/3/135311967/namokinesi-zeremepirufe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_5fd6745a5b0da.pdfIn PDF document text
    • http://fogejebimo.scienceontheweb.net/styrene_production_from_ethylbenzene.pdfIn PDF document text
    • http://mewudaguzexo.sportsontheweb.net/how_many_carbs_are_in_a_nacho_bell_grande_from_taco_bell.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a14e024a-2fd2-444b-bf1b-27f76a35a45e/viwuzuragexowanif.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/sakusijenutavoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8befb337-f3a5-4f21-9bdb-5b23a551d886/is_anatomy_and_physiology_harder_than_nursing_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd73e8bf-de34-43ea-b9dc-732fcbb48b91/kaponilitawimawep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93f73ab-0ea7-4268-88f2-4d45ca94a7bd/80150075326.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/botejubonamolevimijenewap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3acf7132-23e5-4137-9f93-5e24b17b3c85/72726089119.pdfIn 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_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 4960 bytes
SHA-256: 0c8a2171c8c38c3b71080496d883d8c153a0c9441812dc081e2b419b2d1e8c41
font_01_sfnt_off000100f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F3 11260 bytes
SHA-256: 0ae511dcf48c01acd9e5dc0c97ed1e6080ee880bc488142aa69cc5077cf43a04
font_02_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3