Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f367879d839d55…

MALICIOUS

PDF

68.0 KB Created: 2021-09-28 18:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9085e52712a8307318dc80cb962cfa69 SHA-1: 202199b33f559deeea0226cb75dc7835fb0be386 SHA-256: f5f367879d839d553775e9075999ae7eb723102feb788a0dc528ab497c997027
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=electricity+and+magnetism+purcell+3rd+edition+pdf PDF link annotation
    • http://forti.in/userfiles/file/pakarofoxonabenowurep.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/sesujekijote.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/dividedurosijaze.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/retanavoredilugo.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/vibejixevipijobu.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/webirelajujeduzor.pdfIn PDF document text
    • http://jarosi.hu/files/file/xezumizerodanubeluv.pdfIn PDF document text
    • https://balmbeach.hometeamcorp.com/images/usr/8444032793.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/tedurerirujejugimu.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/kejifalirezo.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/52430591601.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613674bb0c241---nusaravosimixelo.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/nodoruzodasodujetunel.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/dazibowe.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/kabeboxagomukudi.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/67709250327.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/72197641297.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/20653561219.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/bizuzenegomawonix.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/poditiwojegi.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/gijeloxevamapomo.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://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_off0000abf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABF0 14504 bytes
SHA-256: e2c02eed5151b3b12e0e613b65e9ff1e7090e976cd331c30cf5f048a9a660faf
font_01_sfnt_off0000cff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF9 11332 bytes
SHA-256: 66848e54ff5129f5bc8bbb22c745de081b143ab609983c42e7c399c28711f793
font_02_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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