Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bcc468cef54dd85…

MALICIOUS

PDF

83.4 KB Created: 2021-04-04 18:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 43feb1001cecc75dcec0b99804b93ded SHA-1: 7052e8f0a06543d808d232ca95da0aeb4709483b SHA-256: 3bcc468cef54dd8589bdc715a6c5ab3e0c9304d8e6d012de3575c538c405e43e
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to direct traffic to malicious or spam sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/strik?utm_term=what+does+grade+12+exempt+mean PDF link annotation
    • http://vivadoctor.ru/vishnu_sahasranamam_tamilkvufd.pdfIn PDF document text
    • http://dream-stat.ru/study_island_answers_for_math_7th_graden5lak.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/reading_fluency_passages_high_school.pdfIn PDF document text
    • http://ru-payment.casa/rokewunizajiduvwzvq.pdfIn PDF document text
    • http://milanomoda.site/chance_would_be_a_fine_thing_synonymzqg8b.pdfIn PDF document text
    • http://gebuhrenfrei-mein.com/486340858344surm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/48607839812.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/adaraya_agamaki_new_music_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e1209a2-2bbf-4803-9f14-8bc7b45b0e7b/mini_cooper_service_centre_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edecbbe9-ecb4-4da4-a043-160d6b97631b/engineering_drawing_abbreviations_pcd.pdfIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_868bc39c73304d0181fddb861d57d826.pdf?index=trueIn PDF document text
    • https://99ca13e2-8bf0-45b2-93fa-bbfb519f101f.filesusr.com/ugd/5392be_738716266e064d73b8cee1704fbfc7be.pdf?index=trueIn PDF document text
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_27330dd3432441a5bfc926414950770e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/849144f4-057e-417c-b10f-6215f44e5797/que_es_prenda_del_alma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206854c7-a29b-4b7f-82aa-6cb0c2a87b1e/jujufirujalusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7542a481-2811-4af0-8124-8eb4cd53b4b8/spider_man_comic_cover_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef940d4e-9284-41cd-a2cc-f67582645d83/rawasubuwetisemuge.pdfIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_6803d63864214efaa355c5145cd5ecbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/61271d6a-6fa9-488a-aa54-1a4e07edd75d/23883204971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d88281-16f4-46de-9fdf-04da77b44bd6/journey_to_the_west_1986_full_movie.pdfIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_419218f70b964574b01988aef348bb93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/479f2f47-43ed-4808-bfb7-3e9056fd3d8f/zadotuxezuxuzakudi.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/fantasy_football_ppr_rankings_cheat_sheet_printable.pdfIn PDF document text
    • http://jujageritoxo.atwebpages.com/lajeneliwagesamolewerare.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/income_tax_return_form_in_excel_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/xilowifures.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_off000106e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E8 5604 bytes
SHA-256: f1c3b5f413fe22c060e0c34c49205ca7b59af3942f52a954b92f72badd95e1ed
font_01_sfnt_off000119e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E7 11228 bytes
SHA-256: fc67a1e8f5675a249b65b0f16022bdc624c30efa1f8657f21cfe030235c986ae