Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43e57cec493799d…

MALICIOUS

PDF

78.6 KB Created: 2021-04-25 15:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 961bd4e5fb55ac69c060664c579fe1a9 SHA-1: 790a76b2263f5c797b8f97395345364034b428ef SHA-256: d43e57cec493799de4096d5c7c73218f3388ef0aef1cf8017ef63933f89f1d61
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content or phishing sites. The ML classifier strongly flagged this PDF as malicious, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, suggesting the document's primary purpose is to act as a lure. No scripts were extracted, but the high number of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=beethoven+piano+sonata+15+barenboim PDF link annotation
    • http://diporesorojina.scienceontheweb.net/12473109042.pdfIn PDF document text
    • http://1offpark.xyz/gravel_road_design_canadathpxf.pdfIn PDF document text
    • https://garevanixuxud.weebly.com/uploads/1/3/4/3/134371644/fepadud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390052/normal_5ff77aacf17be.pdfIn PDF document text
    • https://sixebujexe.weebly.com/uploads/1/3/0/7/130740217/3ba405984d.pdfIn PDF document text
    • http://vomoliba.scienceontheweb.net/convertir_de_a_word_online_ocr.pdfIn PDF document text
    • http://helplnstagramoffice.com/rikikururuniwesdk58m.pdfIn PDF document text
    • http://kevarusakoko.mypressonline.com/2017_scag_tiger_cat_2_review.pdfIn PDF document text
    • http://xiwupulo.medianewsonline.com/company_interview_resume_format.pdfIn PDF document text
    • https://fikoroviv.weebly.com/uploads/1/3/0/7/130740338/908461.pdfIn PDF document text
    • http://sigisuzuk.getenjoyment.net/what_does_fuel_system_too_lean_bank_1_mean.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423137/normal_605a58b97f8f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447436/normal_600655b29e86b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_5feaec9037367.pdfIn PDF document text
    • https://bopexetijajab.weebly.com/uploads/1/3/1/4/131411078/kekugatibawonuw.pdfIn PDF document text
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/5fd19.pdfIn PDF document text
    • http://wigobike.sportsontheweb.net/physical_science_p1_grade_11.pdfIn PDF document text
    • http://indonesia2health.online/14275844740lpwy3.pdfIn PDF document text
    • http://circulyarkadigital.xyz/tididoxunebwbwjb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugenizuridaj.atwebpages.com/ccnp_routing_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5475b49-a11f-457d-9812-c06aea6df8fa/pavijoto.pdfIn PDF document text
    • http://lewomunenuvi.myartsonline.com/pdf_editor_online_free_no_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca391531-20e8-4c49-8e47-e26b81b379e3/36_questions_that_lead_to_love_reddit.pdfIn PDF document text
    • http://wazeniwemir.onlinewebshop.net/morphology_english_language.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_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 5452 bytes
SHA-256: 0593453081faed56099e67f7167c1bd6a5e249e031049168cd759001b1b2f5e8
font_01_sfnt_off00010949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 10384 bytes
SHA-256: 614f0084951bb57a65b6d5d3c48dc75a92605d68934afe3e8b5239776ef1cd7a