Malicious PDF — malware analysis report

Static analysis result for SHA-256 271344ae9217a751…

MALICIOUS

PDF

69.6 KB Created: 2021-04-17 18:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: acfc7bf0d2c876312036623c451a9332 SHA-1: 3375df17a887554f9e296244dbfa93c3c273a78c SHA-256: 271344ae9217a7513f5e902bea7b4b6a5790882941f1d37b196d12bf82f2e107
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one pointing to 'zajinet.ru' which is flagged as suspicious. Heuristics indicate the PDF acts as a link farm, likely designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/strik?utm_term=how+much+money+was+prince+worth+when+he+died PDF link annotation
    • http://tvoeobrazovanie.fun/vixezulugukowuwedatolujiy8ulo.pdfIn PDF document text
    • http://koxivesuvif.mypressonline.com/how_to_remove_the_quick-connect_sprayer_hose_on_a_pfister_faucet.pdfIn PDF document text
    • http://lezobul.medianewsonline.com/caste_list_in_telangana.pdfIn PDF document text
    • http://pinenud.mygamesonline.org/sinaledulasipuxesotiluzo.pdfIn PDF document text
    • http://gusevoxuzuwelap.mywebcommunity.org/assinatura_digital_mac.pdfIn PDF document text
    • http://difozoxezepi.getenjoyment.net/5426573433.pdfIn PDF document text
    • http://italiabeach.space/cisa_study_guide373o7.pdfIn PDF document text
    • http://lorem.space/zivoxizeviv79lg.pdfIn PDF document text
    • http://maturibcgj.space/6_weeks_to_shred_programqhlau.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/the_lost_girl_movie_netflix.pdfIn PDF document text
    • http://theandyhong.com/35206315631ihoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dd6b3de-b3e8-4fac-b93f-41f9485309c5/delil.pdfIn PDF document text
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_4936022a138d422a9f07f8d2e637b185.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/705f3d01-4ce2-4ff2-8780-a1ca77908fb4/how_much_does_equipment_operator_make.pdfIn PDF document text
    • https://df867d32-629d-4b48-af14-2fc5df20f827.filesusr.com/ugd/287761_a62c70c322624c6aa31aced781fc6c08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4eff68c-c40a-47ad-84cb-50a49bb58c39/2018_vs_2019_first_aid.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_28e84452760544ac8bd5f2441ec64845.pdf?index=trueIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_81b0b0a84b23497cb2aff2189b2ccc16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c594c48-46f4-4853-8e3b-54c15d3e5194/how_to_win_the_pick_3_every_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9059ea6b-0200-4c54-883f-2225b12bceef/garmin_vivosmart_4_fitness_tracker_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70eea91a-7d9f-448d-a04a-782b11af3e6d/rizekigepitakulajexen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5090126-2b43-4f51-89e1-8577e29e7457/keto_cookbooks_at_walmart.pdfIn PDF document text
    • http://fogovulosuzan.onlinewebshop.net/9069562209.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/83647760565.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18B 5436 bytes
SHA-256: e6138a68c8253d3bd35ea221997f6768fd4af947ff7fad27bfa064c777afbe21
font_01_sfnt_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 10768 bytes
SHA-256: 3c7baeed80dd1007a4be6b859931656f9dff361b532e3126e90ff6fbdb137880