Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a08e8247cbb87c7…

MALICIOUS

PDF

77.9 KB Created: 2021-04-18 21:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b902422e0e179771ef1916e51b1ba51c SHA-1: 273a3169cb875dc93e04a1b6cc7a2ce0d527d33c SHA-256: 8a08e8247cbb87c7238e38a578ca8f696790701f0fca498a23173d57ad385ed4
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL 'https://baarspo.ru/strik?utm_term=how+to+burn+wheel' is the primary indicator of a phishing attempt, likely disguised by the document's title. No scripts were extracted, but the PDF structure and external URI suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/strik?utm_term=how+to+burn+wheel PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375507/normal_5fc7ed85efa4f.pdfIn PDF document text
    • https://cdn.sqhk.co/fokigegoma/Hidp9CY/ribilekolek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481675/normal_5fe721e81d227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501632/normal_5fdfd4f637823.pdfIn PDF document text
    • http://zobebukore.22web.org/webasto_heater_parts_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414176/normal_606b55ce95bdf.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/jft0Zie/91475346931.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/j8idieG/minerals_definition_nutrition.pdfIn PDF document text
    • http://fenejewok.22web.org/asignaturas_derecho_uned.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/jnifAhg/ieee_conference_template_word_2007.pdfIn PDF document text
    • https://cdn.sqhk.co/gulizate/Dx4hc96/us_vice_president_debate_2020_live.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/subordinate_clause_exercises_with_answers.pdfIn PDF document text
    • http://puwevaladimeve.epizy.com/no_country_for_old_men_book_summary.pdfIn PDF document text
    • http://guwebazumojopa.epizy.com/66320580186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc8d2d1-b81c-4c9c-946c-fed7bf0f9eb1/bukakuku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f1d5781-3228-49d5-a453-c091e3435508/nature_reviews_molecular_cell_biology_impact_factor_2017.pdfIn PDF document text
    • http://dijorud.epizy.com/codices_de_mexico.pdfIn PDF document text
    • http://lawigut.rf.gd/sanedamasip.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/detijagora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c1a6263-210a-4bbc-be34-5496f3306317/87351667940.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/51333172021.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/kemejowegogezaxuja.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/android_tablet_antivirus_reviews.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_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 4576 bytes
SHA-256: 2dce99d9c1643f81d2857e760336faafc26a3af97c5be79086b6ac7bb60c7646
font_01_sfnt_off00010557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 10400 bytes
SHA-256: 871028beaee30481a3635bdb32081a5c5b2f5a00af005dcd07ca5fe538c52da6

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