Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f3b1d3cf83bdff…

MALICIOUS

PDF

76.3 KB Created: 2021-03-20 04:52:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f3704606a9c723c9fdbf4ab0d91adf38 SHA-1: e6012b4bba2edc6ad7458dce00575216c1284b20 SHA-256: 35f3b1d3cf83bdff60a37eba6e95c49514eb7839b44215081e87b9aca4bb8cea
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/award?keyword=non+parametric+test+pdf PDF link annotation
    • http://pejazadajenatew.getenjoyment.net/how_to_think_about_weird_things_8th_edition.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/mijabodikejefalugip.pdfIn PDF document text
    • https://litokotivugobud.weebly.com/uploads/1/3/2/6/132695550/burozufawukepi.pdfIn PDF document text
    • https://zuvimetuna.weebly.com/uploads/1/3/5/3/135304981/nodumuwufumopug_puwukitomope_lolomozuxedu_jisapesewe.pdfIn PDF document text
    • http://homebig.space/micromax_android_one_bodyb00ec.pdfIn PDF document text
    • http://meblik.su/42458072567wuiug.pdfIn PDF document text
    • http://getsol.xyz/85119905247kx0zx.pdfIn PDF document text
    • http://bokulidedasez.22web.org/time_management_techniques_for_employees_ppt.pdfIn PDF document text
    • https://dumaxenuwumav.weebly.com/uploads/1/3/3/9/133997891/vorexukomibir_povifujazep.pdfIn PDF document text
    • http://winefesa.22web.org/football_training_plan_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/Jijjg59/marapidirozibewuniz.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/jfT3BtM/tusatipabiwotiwotezosi.pdfIn PDF document text
    • https://tukusalo.weebly.com/uploads/1/3/0/9/130969921/895122394.pdfIn PDF document text
    • http://tadiwojewuji.iblogger.org/indian_stock_market_technical_analysis_tutorial.pdfIn PDF document text
    • https://dekedenavit.weebly.com/uploads/1/3/4/6/134612093/bokako.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/ceCmjhw/46615054481.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/gffaxJA/46735867989.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/gdYCNgj/iot_reference_architecture_aws.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://romisov.epizy.com/lapijodekijewax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff1c93f9-2bd6-4203-aa43-0ab4ce05efd6/56571711355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71376ffc-3641-4b08-8d69-a78b06775cb7/sharp_objects_trailer_2.pdfIn PDF document text
    • http://suruliloxapesas.myartsonline.com/tikakowad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c95e7be-6558-4920-9545-d47c322d658c/gerente_de_alimentos_y_bebidas_en_ingles.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_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 5240 bytes
SHA-256: e76c84fd551b2e20dcd12a71b562238256621a737fbeacc87b8016963fbf42f5
font_01_sfnt_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 11280 bytes
SHA-256: b1b0ecb2b1b45edd68d22fd274ef2f8a9ed3ca2daad4bf951b3ba2f49e5a2281

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