Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3783be38714364…

MALICIOUS

PDF

83.1 KB Created: 2021-04-16 12:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4b96c4382c3e9577de159c600959b640 SHA-1: c8e6045b147108b054551717dd742a500bf475c5 SHA-256: af3783be38714364c36b828d07df9606c363b85f8a9b13f264244c13f60b367a
126 Risk Score

Malware Insights

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

This PDF file is classified as malicious, containing numerous external links to disposable hosting sites, many of which are likely part of a link farm designed to obscure the ultimate destination. The primary URL, 'https://vilenefex.ru/strik?utm_term=storyboard+pro+7+free+download', suggests a lure for software downloads. While no scripts were explicitly extracted, the PDF structure and extensive link farm heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/strik?utm_term=storyboard+pro+7+free+download PDF link annotation
    • https://tuwakunasuj.weebly.com/uploads/1/3/0/8/130874309/576172.pdfIn PDF document text
    • http://nickned.me/reasoning_questions_and_answers_for_bank_examsax876.pdfIn PDF document text
    • http://vizojuzoninunoz.scienceontheweb.net/63522236643.pdfIn PDF document text
    • http://movilatur.iblogger.org/the_mentalist_season_5_episode_5.pdfIn PDF document text
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/1689151.pdfIn PDF document text
    • http://vvinorama.fun/fundamentals_of_human_resource_management_gary_dessler_2016df19u.pdfIn PDF document text
    • https://pitisugokusibim.weebly.com/uploads/1/3/4/4/134445344/zekawogeforur-siwopapimapo-sezaxesuwixi.pdfIn PDF document text
    • http://cashfree.store/sistema_endocrino_y_sus_organos_que_lo_conforman6f3zy.pdfIn PDF document text
    • http://cetop.xyz/73758317619qm9m0.pdfIn PDF document text
    • http://batizilojado.22web.org/61233788255.pdfIn PDF document text
    • http://serururepus.scienceontheweb.net/echo_srm_210.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/kalender_2020_lucu.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/68994653143.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/23230727479.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
    • http://refusunono.onlinewebshop.net/biography_of_abraham_lincoln_in_english.pdfIn PDF document text
    • http://worubag.epizy.com/84008489874.pdfIn PDF document text
    • http://xekapakifujekem.onlinewebshop.net/pencil_2d_animation_tutorial.pdfIn PDF document text
    • http://lizolubemerawi.epizy.com/bikini_body_guide_3._0.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/xuzakodumirubumekive.pdfIn PDF document text
    • http://mibavened.rf.gd/68759273243.pdfIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/anemia_hemolitica_autoinmune_en_pediatria.pdfIn PDF document text
    • http://fukodagugino.rf.gd/mukovivifurowupolorawa.pdfIn PDF document text
    • http://xorabaza.rf.gd/86982391207.pdfIn PDF document text
    • http://pububebojivoru.epizy.com/dd_5e_druid_spell_guide.pdfIn PDF document text
    • http://lipelizirivalul.epizy.com/cornerstone_chords_in_d.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_off0000f871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF871 5112 bytes
SHA-256: 8e5246beec8dc622f33b95ced6015ea873fe2cdcf8e6d7cc035335b6d7829b0a
font_01_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 11500 bytes
SHA-256: 20d31a5db1128c9bbcdbf48d3c45c4fb63a6cba5dcc29d52ceeed49d546d2b55
font_02_sfnt_off000130d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D9 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378