Malicious PDF — malware analysis report

Static analysis result for SHA-256 90929a4533b25571…

MALICIOUS

PDF

85.3 KB Created: 2021-05-12 20:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e50632099bfb9813d081106b3062c36c SHA-1: eb9335f075b0e0629e0376a90a652faf96d31434 SHA-256: 90929a4533b25571467f9d86dcdc70cb96ca52bda80d10e45b6c84ace9951d9e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one prominent URL being `https://midufefew.ru/strik?utm_term=boy+in+striped+pajamas+sparknotes`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a non-clustered link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content, likely a phishing lure or a downloader.

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://midufefew.ru/strik?utm_term=boy+in+striped+pajamas+sparknotes PDF link annotation
    • http://bevamifugidujew.scienceontheweb.net/19475312992.pdfIn PDF document text
    • http://virenoveza.22web.org/siworuwusa.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/Vhhc3ij/candy_run_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425010/normal_602a9cc88a024.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/5hdzjei/jawidusufadadabemamomos.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/bqjgjLB/91353021873.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449406/normal_60063f9222bfa.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/ugjCjde/wolujevel.pdfIn PDF document text
    • http://wuxabikizumir.22web.org/good_food_guide_top_50_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotinulimoruv.rf.gd/rational_algebraic_expressions_examples_with_answers.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/what_are_the_7_deadly_sins_catholic.pdfIn PDF document text
    • http://zosuvupetod.epizy.com/descargar_libro_aprendiz_de_brujo_pnl.pdfIn PDF document text
    • http://xifazofikumufe.epizy.com/what_does_tango_foxtrot_mean.pdfIn PDF document text
    • http://nutonujisebife.epizy.com/7985411136.pdfIn PDF document text
    • http://welokisixipapa.epizy.com/test_cricket_score_sheet.pdfIn PDF document text
    • http://roxuriwiladubew.rf.gd/dinatawid.pdfIn PDF document text
    • http://kanobar.epizy.com/bafozubakewidekogum.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/modern_periodic_table_image.pdfIn PDF document text
    • https://s3.amazonaws.com/goveruduzewoxu/quimica_organica_exercicios_resolvidos.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/how_to_make_a_target_stand_out_of_pvc_pipe.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/autocad_2012_software_download_for_windows_10.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_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 5364 bytes
SHA-256: 4323a7e360f1effeeabd35906d1cf8017c35a1383a641f832ed1c63dc9cc2bd4
font_01_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 11492 bytes
SHA-256: ce39976ae864bc41a490613c1d47d73ac5679e1a9a5aa43d798381d34d9692b5

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