Malicious PDF — malware analysis report

Static analysis result for SHA-256 06215ad43865d3da…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 04:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e55a19572c31df87a817c5ed6001609 SHA-1: 97dfe5bcc879a306f056e2c674253f3ffc06574c SHA-256: 06215ad43865d3daba84544b61c35787b708481f9fd066f8b8fc080217acd9f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains 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. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=get+insta+followers+app PDF link annotation
    • http://bezpiecznamlodosc.org/files/file/rupuwadimemukewi.pdfIn PDF document text
    • https://rais.bg/uploads/file/simurofababemebedilusofi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2074c28c---rigarox.pdfIn PDF document text
    • http://jump360.co/upload/files/20210902152650.pdfIn PDF document text
    • https://fasaac.org/temp/files/lubalaki.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/suralodisikekonexa.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/28396939606.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/67818090498.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/4b0e165a2bfeb9ebf6f7ec496a007bd1/mabesegofipinanuze.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/jewusukojakejuk.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/rezogomumemarumozax.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/dalolaxejapipaxa.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/tetopedisesogade.pdfIn PDF document text
    • https://seerupit.dk/assens/file/wemak.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109042301395098.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/vapazomumiwomebapuga.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/kuzutixesuxe.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/bijope.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/12058180341.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/88774507302.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/13138306998.pdfIn PDF document text
    • http://air-con.ru/upload/files/balemufoxates.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/33938133135.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_off0000db0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0F 17608 bytes
SHA-256: 0473678178c523ba76dd52a9cf3423e04ba18ba215725f183e56d89ab90cf8ad
font_01_sfnt_off00010872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12089 10476 bytes
SHA-256: da84a6a4910e6521c5fb8b095d085345734496c374d9e7bb5a6cfc4321b152da

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