Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41fcadc4f539870…

MALICIOUS

PDF

76.3 KB Created: 2021-03-30 00:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3be8523a8c3321d8325fcce8832cc743 SHA-1: 517b55e6be070242cdb4b8bce4029e2bc062f49c SHA-256: c41fcadc4f53987087322be92f58c0cfb0f6b89527371998e7662290487418a1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/strik?utm_term=burnham+commercial+boiler+warranty PDF link annotation
    • http://ravevuzovije.mywebcommunity.org/72702552519.pdfIn PDF document text
    • http://sportplays.ru/zukemizedonuvejagzo9w.pdfIn PDF document text
    • https://zawoluzowusemad.weebly.com/uploads/1/3/4/6/134697528/rusimowebabixelugi.pdfIn PDF document text
    • http://uscarinsurance.info/73017485859jr5xs.pdfIn PDF document text
    • http://tehnikator.ru/142824706543p47m.pdfIn PDF document text
    • http://legionmone.xyz/lovesodawidipimiw31v40.pdfIn PDF document text
    • http://bbcua.site/13818428146tjs64.pdfIn PDF document text
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/9843296.pdfIn PDF document text
    • http://naturka.space/graceful_wendy_mass_freeevbum.pdfIn PDF document text
    • http://fuxanujibiz.mygamesonline.org/magnificat_taiz_partition.pdfIn PDF document text
    • http://ilkertr.shop/11324293867jbn5j.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/52735488945.pdfIn PDF document text
    • http://wowitaly.pro/92783033874p3jbw.pdfIn PDF document text
    • http://kukushpa.fun/facebook_contact_number_united_states8n1d4.pdfIn PDF document text
    • http://wovoradomumakil.medianewsonline.com/embryo_sac_development.pdfIn PDF document text
    • https://wubepifumemav.weebly.com/uploads/1/3/4/1/134109226/93115628bef6f.pdfIn PDF document text
    • https://poginatiru.weebly.com/uploads/1/3/0/8/130874277/kodunoresosujilemox.pdfIn PDF document text
    • http://vash-komfort5.ru/hotel_formule_1_boulogne_sur_mer_telephonem6li9.pdfIn PDF document text
    • http://arenda-comp.space/traducir_en_espaol_a_ingles_en_audio7zks8.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/english_grammar_learning_book_free_download.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/3955806.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/roadmaster_granite_peak_24_specsiulxy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokosen.atwebpages.com/69924648610.pdfIn PDF document text
    • http://nononulavojiki.myartsonline.com/automobile_industry_introduction.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_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 5244 bytes
SHA-256: 1c5f5950417c1c2641d1078e291dd22212be65170fb30a9e5059b680707ec9e1
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 12720 bytes
SHA-256: 895302db7793f06a7d5ff6c8cc46cf7b7c351b408523779c7846a775dff10eca

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