Malicious PDF — malware analysis report

Static analysis result for SHA-256 440ea25a2a8195f0…

MALICIOUS

PDF

75.4 KB Created: 2021-09-14 12:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b743dd10b806319c4e380a0c06ca8f4b SHA-1: 7f6254c4a01cd226c01c8221c396a1d8cc137ff0 SHA-256: 440ea25a2a8195f0e7b33bd1e03b598efc1b04a80888f475e0375346427b9e45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were extracted, the structure and URL distribution point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 5

  • 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.
  • 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://machnik.net/ckfinder/userfiles/files/41248645836.pdf In PDF document text
    • http://almawred-sy.com/files/adminfiles/files/wenelavanuvasep.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/23875115107.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/89969565976.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/19229118756.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/rerim.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/24129149272.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/luxilaf.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/16372509717.pdfIn PDF document text
    • http://bienbao.net/uploads/files/pawedinibawukigovatuk.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/jelaxopekijorumiv.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2b1219da---wuwemekowofogiwuf.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/tevolizidafukaduf.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/67544254122.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/17259760509.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/xezukewutatogeluxasewek.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/53851985260.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/vuwipubivuzavasokoje.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3c17c635b---dosizenenaxamitaludogu.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/kofimamakidoboworogixuk.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/55420800622.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/pupuwevaranituvavimagopol.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/nomubikorem.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/22762487113.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/zonamijuxujovig.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/batiboguxoferakumuzu.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/sexuboxetilaxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+lost+devicePDF 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_off0000c5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D2 10248 bytes
SHA-256: acd8e7887aa77a36799b313ddca3494dc74510db7c13906184d74947fe2e8af7
font_01_sfnt_off0000dcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50D 16780 bytes
SHA-256: 6dc68e481935f1456ab28aa543021075f0b2f84d33fab90a6a875cabdd7f37a8