Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff6b09fca3ccafd…

MALICIOUS

PDF

87.9 KB Created: 2021-04-01 18:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2ca69b3e96dce09b678c633cc9ac868f SHA-1: 2bd6c310b5d2feab99e31838e7be72bc05a3d6fd SHA-256: 4ff6b09fca3ccafdc1edc1029fdd39c7dd92a0b3cda11a8270daee694f335a01
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text related to a book search, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=donde+puedo+comprar+el+libro+azul+del+padre+gobbi PDF link annotation
    • http://idealica-italiauficiale.website/budhana_budhana_songnv9ks.pdfIn PDF document text
    • http://rupaduwovuw.getenjoyment.net/65117056884.pdfIn PDF document text
    • https://nuwukovodikala.weebly.com/uploads/1/3/4/6/134666266/tafamo.pdfIn PDF document text
    • http://chempion.coffee/university_of_edinburgh_undergraduate_application_formngfx8.pdfIn PDF document text
    • http://powuvomewekuxeb.getenjoyment.net/levuwuxakano.pdfIn PDF document text
    • http://padojobimo.mywebcommunity.org/cengage_maths_book_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_60633ce699ceb.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/land_contract_form_ohio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_602305e35eed1.pdfIn PDF document text
    • http://goldenframecollision.com/87478894470mzqad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_604d34c55547f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408584/normal_601db5cd3df94.pdfIn PDF document text
    • https://vudujetejagug.weebly.com/uploads/1/3/4/6/134674723/6b9ffc40146ccf9.pdfIn PDF document text
    • https://mesakarune.weebly.com/uploads/1/3/1/3/131380767/vulemededon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pexirud.onlinewebshop.net/43441781131.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/tamil_bhakti_hd_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d77a92-a268-465e-857c-4879e19e755d/zebujoledufexijuligupubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3888d346-4fa9-499d-a2c9-70d790e4a685/molusuwenumesoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5402e1dc-cb8e-4b61-9f7a-af7a5d802ec6/40044390478.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/dark_web_browser_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/best_crisp_percale_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb6058fc-af3c-485b-8720-572eded14b4c/musemanezasumivisobuzom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4140965d-b5ab-4fff-a752-088183104cdc/mackie_control_universal_manual_espaol.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_off00011376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11376 5404 bytes
SHA-256: 89d19c47eb4b6b650ba0b833c822ea0e159225327b00f712301b6aa9104e8603
font_01_sfnt_off000125c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C4 13364 bytes
SHA-256: e094d04379088ee2a57440c70718c58eba5a9ea2faf4cb317fbbe99d82585297