Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc86a0bd8361bea8…

MALICIOUS

PDF

75.6 KB Created: 2021-03-19 17:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ea0e75033c572c8aae8758735b710cd0 SHA-1: 1a3c1dcd0b6a80952c1eb8b668b87ea542f8f805 SHA-256: dc86a0bd8361bea87aa60cfd0220b01776ff7a21410530427992e7b171170b61
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 flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The document body, though heavily obfuscated, contains keywords related to 'Ielts reading test' and 'pdf', suggesting a lure to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/award?keyword=ielts+reading+test+general+pdf PDF link annotation
    • http://mufosubofamar.mywebcommunity.org/warcraft_2_full_movie_in_hindi_dubbed_download_filmyzilla.pdfIn PDF document text
    • http://mojipepofakakoj.22web.org/tupojametokiru.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/Ljfien6/electric_motor_for_hammer_mill.pdfIn PDF document text
    • http://italywow.info/49181527018nqqh5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_600eb719c10a8.pdfIn PDF document text
    • http://bitejes.iblogger.org/fufowipadodezatozabeto.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/56594385817.pdfIn PDF document text
    • https://cdn.sqhk.co/wusirilunoko/4XVuZja/muliwiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494875/normal_605128a4a8638.pdfIn PDF document text
    • http://xubajaw.iblogger.org/juxabuladavi.pdfIn PDF document text
    • http://fortuneo.biz/rexivudilelzax3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_602407267f191.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/ewkJgeZ/popekavutikonuwoda.pdfIn PDF document text
    • http://reestr.site/xazaxcrtlw.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/resumen_de_capitulos_del_libro_el_jardin_secretogjzpv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_5fd643ddbf232.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/zojizogotegejemibeweri.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/5hbhkhi/volutopijaduzekajifomexu.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/3dKHvoD/sutozusi.pdfIn PDF document text
    • http://macsk.space/excel_vba_worksheetfunction_listu21az.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vagaloxesawazo.rf.gd/conclave_ck2_guide.pdfIn PDF document text
    • http://jolavewavesuj.epizy.com/juwixixixujedegaxag.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_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 5148 bytes
SHA-256: 2c2b300537c9b9de9c904df784751dee5f09742c1efc16cfd1ed6bccd95567f3
font_01_sfnt_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 10940 bytes
SHA-256: 76767c03819a422071738f65d58fa183316ea1405bb9ad91228db5aca82cda97

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