Malicious PDF — malware analysis report

Static analysis result for SHA-256 678cd845fa5a2f8d…

MALICIOUS

PDF

148.3 KB Created: 2021-03-24 18:29:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3288642827b5ad86ff695b2c06397284 SHA-1: 7b97693f18fd4daee706e1b52cf87d4b96be854f SHA-256: 678cd845fa5a2f8da8864b02e79f2d9e57d4fdc12033e8509f433837f235fdfc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('jacksth.ru') and another to a link farm hosted on disposable domains ('vefavirona.22web.org'), suggesting it's designed to redirect users to potentially harmful content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jacksth.ru/award?keyword=boule+de+suif+guy+de+maupassant+pdf PDF link annotation
    • http://vefavirona.22web.org/dupapuk.pdfIn PDF document text
    • https://fusajowaxoxa.weebly.com/uploads/1/3/5/3/135344195/bogoposeluxomalulex.pdfIn PDF document text
    • https://mekupefaju.weebly.com/uploads/1/3/5/3/135316310/9464d7c1.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/chhXQ91/hero_xpulse_200t_mileage.pdfIn PDF document text
    • https://ditufanavuj.weebly.com/uploads/1/3/0/7/130738569/8090768.pdfIn PDF document text
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/nebize.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/AChgfhf/rush_ball_dancers.pdfIn PDF document text
    • http://lodemazupunogas.iblogger.org/61538326919.pdfIn PDF document text
    • http://nopezimugabotik.mygamesonline.org/encyclopedia_dictionary_free_download.pdfIn PDF document text
    • http://penexej.mywebcommunity.org/bositu.pdfIn PDF document text
    • http://sewatumafuta.medianewsonline.com/how_to_write_a_5_paragraph_essay_for_6th_graders.pdfIn PDF document text
    • https://cdn.sqhk.co/julukijowi/iJ3hcou/gb_whatsapp_v_7._20.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/IoOSthc/lupatuxakaxotoxavobujopir.pdfIn PDF document text
    • https://cdn.sqhk.co/telazaje/iZuUjc7/cover_photo_collage_maker_for_facebook_timeline.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/kamiduna.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/amelie_soundtrack_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/lodikorep/ggj7igG/zegikudilogekif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gozegatunefafet.epizy.com/kenmore_dishwasher_kick_plate_installation.pdfIn PDF document text
    • http://tumobuwixakeg.atwebpages.com/how_to_check_undefined_symbols_in_.so_files.pdfIn PDF document text
    • http://gumizaxewa.atwebpages.com/ielts_listening_answer_sheet._download.pdfIn PDF document text
    • http://wesaloxovep.rf.gd/el_regreso_liberal.pdfIn PDF document text
    • http://samajusinifako.atwebpages.com/vehicle_bill_of_sale_template_fillable_free.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20EC3 5416 bytes
SHA-256: 043f9e5c212043242b9ea56409e9528acb8dbfaef5ff00c8ebc2fa17e821d4cc
font_01_sfnt_off0002212f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2212F 10092 bytes
SHA-256: 986753f0b24633bd83a64a469326dda38e135bb95474ccd1453409185cb77434

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