Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5551581cb15c191…

MALICIOUS

PDF

76.1 KB Created: 2021-04-17 00:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 105f108bef6b93fea6bb8baea378533a SHA-1: 582a03dc1cb461e72c4a5d9b165e84550342336c SHA-256: f5551581cb15c1916b595784b305a8fa5f1e4e3d9c980fa6eef7ec04fc678be3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using many links and disposable hosting. No scripts were extracted, but the presence of many external URIs suggests the primary function is to redirect the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=how+to+use+shop-vac+wet%252Fdry+vacuum PDF link annotation
    • http://medicalpracticementor.com/aircraft_design_a_conceptual_approac6wtse.pdfIn PDF document text
    • http://mafebeb.22web.org/world_chelonian_trust_care_sheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492871/normal_605acad0286c2.pdfIn PDF document text
    • http://govnososal.xyz/samsung_notes_not_working_after_update_2020i8m87.pdfIn PDF document text
    • http://ragaliteres.iblogger.org/complexity_and_contradiction_in_architecture_free.pdfIn PDF document text
    • http://changely.club/91397881704d42o0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496815/normal_60402cf8d2d77.pdfIn PDF document text
    • http://moscowflowers.shop/490001628599sm5p.pdfIn PDF document text
    • http://grigolia-studio.ru/mewujolujajifosagazekedukpa4ru.pdfIn PDF document text
    • http://temppicture.xyz/is_1_police_plaza_open0k6o4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_6048dab1b3de2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373504/normal_6043bc22352fb.pdfIn PDF document text
    • http://pc-remont.website/did_palpatine_create_anakins_visionszm4am.pdfIn PDF document text
    • http://1xbet-registr.site/25840145789r2h6w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xirixoxixewop.epizy.com/niwenaxipotarope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b80ac5ab-50fa-4dbb-987f-e028bff79c8f/74709812766.pdfIn PDF document text
    • http://rewurowak.rf.gd/vaughn_bioethics.pdfIn PDF document text
    • http://jepinoxuj.epizy.com/piladulozasepu.pdfIn PDF document text
    • http://depaxagezesezaw.epizy.com/albertsons_application_form.pdfIn PDF document text
    • http://bezexus.rf.gd/tractor_chassis_design.pdfIn PDF document text
    • http://nenedabex.rf.gd/latutumifoxanixixit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31b7a7cf-cb63-4c9c-83f1-9b86a33069c1/ferefekixorexonawuf.pdfIn PDF document text
    • http://dumufal.rf.gd/the_lightning_thief_summary_chapter_4.pdfIn PDF document text
    • http://dorurefu.epizy.com/50684331376.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_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 5564 bytes
SHA-256: e1e6e7f1d22ee7a5681d928bc101451d5e85e0e595275d710085dd92d4ec384a
font_01_sfnt_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 10404 bytes
SHA-256: c352f749ae94f29d905168f48e587b2eedfcba1d299d05069dca5396b2ed416c

Open this report in the interactive analyzer, or submit your own file for analysis.