Malicious PDF — malware analysis report

Static analysis result for SHA-256 808b0d528710c716…

MALICIOUS

PDF

85.4 KB Created: 2021-09-16 17:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6e46296c6d0ac0d585fd4a5968edfad1 SHA-1: e58605d3a3f3a5255d99542a442c3b193d4c7a97 SHA-256: 808b0d528710c716dc0855d1b8ad0d7e675f8cc2b9d0320556905cfa39e591a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious domains. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to external sites, likely for phishing or malware delivery.

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://ketchas.ru/uplcv?utm_term=tipster+app+android PDF link annotation
    • http://interstyle.org/content/xuploadimages/file/80031238338.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/gufaditisokawegefekufulis.pdfIn PDF document text
    • http://emeat.ru/var/files/xokumo.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///lerapisoxulof.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/24827756998.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/kogenepesifefad.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/subikejijeru.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/14655826680.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/poloxanosigokuremifokesi.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/40484998515.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/kafekogitafufidemerikap.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/zapiziviv.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/toniposufesazepasug.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/rewedisojidozi.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/vetosav.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/68390741247.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd5a6aff5---kuzisidafetirob.pdfIn PDF document text
    • http://vejwun.cz/images/72119315260.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/37332935066.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/sazaxabaxowapalaranag.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/dubozesureli.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/tutanajofuruminuz.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/8946738589.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_off0000ea4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4C 10300 bytes
SHA-256: 693ffad4c68c19bde3fc838a55fa0c2222f129d1580b6f40b7bd19141c2da47d
font_01_sfnt_off000101a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A2 17868 bytes
SHA-256: d996b52a071f2fb60d49f82b0c4bfc29ffcd3b5546e17fe771738750510e51b3
font_02_sfnt_off00012fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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