Malicious PDF — malware analysis report

Static analysis result for SHA-256 4290cef8debd5319…

MALICIOUS

PDF

81.0 KB Created: 2021-04-17 17:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 24b08b6cc6857def7ff1127e46062b68 SHA-1: 6851e4a4b86b1777dab91ea154b215d7d7bb63aa SHA-256: 4290cef8debd5319c3b362fccc6e54f135419d63008aee549b00fa9b47a9861f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, and is described as a link farm. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bologen.ru/strik?utm_term=different+movie+genres+in+french PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467612/normal_6032d10b3d7d9.pdfIn PDF document text
    • https://ripafikumitepi.weebly.com/uploads/1/3/4/6/134622323/sefunaru.pdfIn PDF document text
    • https://xudekumuf.weebly.com/uploads/1/3/2/6/132681038/dumemumizozemof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381528/normal_6049bef354632.pdfIn PDF document text
    • https://cdn.sqhk.co/govovazeket/tngcgfS/black_desert_online_crafting_tools.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/d4oyRq1/word_for_hospital_room.pdfIn PDF document text
    • https://vezitiratad.weebly.com/uploads/1/3/1/8/131856143/vepepupubu_sunuxelovaro_guvas.pdfIn PDF document text
    • https://pekafajifazudo.weebly.com/uploads/1/3/4/4/134478446/44748f12d6afc.pdfIn PDF document text
    • http://muzoc.xyz/wigafefibopemuud50s.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/monitoring_and_evaluation_plan_sample.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_6042f5b16d387.pdfIn PDF document text
    • https://feliwisinawo.weebly.com/uploads/1/3/1/8/131856919/kidemejanugetiw-rajaboxigixuves-vadase.pdfIn PDF document text
    • https://cdn.sqhk.co/lejukujegomi/eggV3jf/86899222039.pdfIn PDF document text
    • http://xruhdfo.site/25392825667gldjc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_6025dd83155a8.pdfIn PDF document text
    • http://vojidovalo.iblogger.org/rejigugiwatujed.pdfIn PDF document text
    • http://nutristrike-shop.ru/rufinuvomikgt77m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421934/normal_6015bb7411b26.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://zigolura.rf.gd/agriculture_in_ghana.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/juluwobinikegafon.pdfIn PDF document text
    • http://kawojimulogizef.rf.gd/free_biweekly_timesheet_calculator_with_lunch_break.pdfIn PDF document text
    • http://lolunoxij.myartsonline.com/illinois_vehicle_bill_of_sale_template_fillable.pdfIn PDF document text
    • http://xebesisogunodok.rf.gd/swiffer_wet_jet_wood_floor_cleaner.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_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 4900 bytes
SHA-256: 53c2ef6ebb581d97576f65c5633c60bae1894730f8465f769a1a668ee3579802
font_01_sfnt_off00010435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10435 10624 bytes
SHA-256: 1878b6e7585ab002ae27ac3fd2cbcb2ce6148cfe9628621e107d5ea2f7b0221a
font_02_sfnt_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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