Malicious PDF — malware analysis report

Static analysis result for SHA-256 3774365cf7ea857a…

MALICIOUS

PDF

76.2 KB Created: 2021-03-11 02:07:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7ce7c912d1882407853882d0aae248b5 SHA-1: cb4d65234b428908e6141e353d93fbec6cb6bb0c SHA-256: 3774365cf7ea857a35bed6e8e134712a205151ad002b4825e769df0215d5d2f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, including one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of PDF-specific heuristics and the ML detection strongly indicate a malicious intent, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=comptia+cysa+study+guide+pdf+download PDF link annotation
    • http://ziwusis.getenjoyment.net/13337542871.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/problematicas_educativas_en_colombia.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/Ugdeiib/ragedapotofuvigetanesidu.pdfIn PDF document text
    • https://cdn.sqhk.co/jozazixefuf/ggjidy6/hp_server_remote_management_card.pdfIn PDF document text
    • https://xejinifinedi.weebly.com/uploads/1/3/5/3/135305438/miger.pdfIn PDF document text
    • https://cdn.sqhk.co/joxipadij/gO1gcKe/26725173239.pdfIn PDF document text
    • https://tugoxalimirufa.weebly.com/uploads/1/3/4/3/134310877/kuviteb-zovalilojed.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/vuridokufesefamalu.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/autodesk_3ds_max_shortcuts.pdfIn PDF document text
    • https://xidalivukudupet.weebly.com/uploads/1/3/4/3/134319957/2e890c8cd58a43.pdfIn PDF document text
    • http://ribadubeko.scienceontheweb.net/mifubuta.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/que_es_proyecto_de_investigacion_y_cuales_son_sus_pasos.pdfIn PDF document text
    • http://finonit.mypressonline.com/michel_foucault_quotes_love.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://toxifiv.myartsonline.com/35146677733.pdfIn PDF document text
    • http://tivakifuzir.atwebpages.com/vemimuketewoxojolaketuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9b0ffe7-00c9-4ae1-9e9f-2986df6962cb/tipenafilamivid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/735f2ace-2670-492c-8ed0-0f6ba73f1e74/73928461424.pdfIn PDF document text
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_63db8ebef5594137a430f46e0171bd95.pdf?index=trueIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_ae0a9ec487f4491d9a96e7c741b67825.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84915f44-175b-4d8c-af33-1efe1244d79b/critical_analysis_essay_introduction_sample.pdfIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_0d2ccb24d22e4168be56c77a7a2f5911.pdf?index=trueIn 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_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 5480 bytes
SHA-256: 6ff6652adb55e53d926333da824a880d71c20914613a9cc8923e3b6ec3688c8e
font_01_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 11236 bytes
SHA-256: 8ea8fd14645617f660f9a583a848cf2f54ca96a8371acf99f5bdc084d43d1043

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