Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f04500a86574088…

MALICIOUS

PDF

83.9 KB Created: 2021-10-12 14:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dc9b43fb7854adfabc73aa01a4ced0cf SHA-1: 4322d9b7a72051bad0f2f83394b391e0ea5bd1b8 SHA-256: 3f04500a86574088cebc14eb34ec075faebf7dd73c027e1031671a3a19c36649
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://skyrybupaslaugos.lt/uploads/files/42458510664.pdf In PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/wurojawam.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/bupofapep.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130af1ae9b32---dematovaw.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/bixexejekituvamit.pdfIn PDF document text
    • https://parkerboat.hu/js/ckfinder/userfiles/files/30296047953.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/namivazidofikewarubu.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/niwuvek.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/76606797336.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/7893876573.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/disavapafuwepejujojasanet.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/9781548600.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/daxetixoxoxuralujevi.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/nesamupatuseb.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/nokefagoguditeno.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/39469164531.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/12355587399.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/nadasuliwaxesovazo.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/dulosobarajuvusov.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/55232468262.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/pilivoz.pdfIn PDF document text
    • https://makenie.com/upload/files/tazufali.pdfIn PDF document text
    • https://rajakedua.com/contents/files/liwitetitixan.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/fonawol.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/30351685444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/4dZi1sgP-vI/uplcv?utm_term=borderlands+3+pc+game+savesPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 10956 bytes
SHA-256: 25808da852bc646907d5326de523320e47cfbe60bd6cab3c58e202bcb10601bf
font_01_sfnt_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 19112 bytes
SHA-256: ab63cad316e85d98f52c88ac9d1afc5b5b8c2b7747108804ac67f9d012007dbd
font_02_sfnt_off00012835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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