Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8fe0a0b9f93621…

MALICIOUS

PDF

89.9 KB Created: 2022-05-11 12:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-05-09
MD5: cf0044c0f219dc5f84f79ab0025069ad SHA-1: bde9346bf4a48c10a4a0780e3c14959a595b518b SHA-256: cb8fe0a0b9f936219357145dff10b1fdb6fcdc4b492183debc28bc8a43403f19
126 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://wirut.co.za/YmrXLWy8?keyword=cell%20membrane%20and%20transport%20graphic%20worksheet%20answers%20key%20pdf%20format%20pdf PDF link annotation
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16242e41b891cf---15348453079.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/fepavidabekizux.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/12707622398.pdfIn PDF document text
    • https://zubotovilep.weebly.com/uploads/1/3/4/5/134581484/nodif.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/67237804003.pdfIn PDF document text
    • http://legrand-etika.su/kcfinder/upload/files/tabaxutoje.pdfIn PDF document text
    • https://westpakusa.com/phpsites/vertical_living/uploads/file/suvofawebowebarapop.pdfIn PDF document text
    • http://www.superprzygoda.pl/galeria/files/77203377781.pdfIn PDF document text
    • https://kagedevuj.weebly.com/uploads/1/3/4/6/134643161/ed1f9752c6.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/wumetesezodotefasag.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/16658007423.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/67241230371.pdfIn PDF document text
    • https://duzebovad.weebly.com/uploads/1/3/4/3/134316699/takaned.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/70592276416.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/gobitepikasoku.pdfIn PDF document text
    • https://keziputaxa.weebly.com/uploads/1/3/2/7/132711938/baperezafo.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/63284739103.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20220429023115.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1650811502.pdfIn PDF document text
    • https://niladomawinur.weebly.com/uploads/1/3/4/8/134875702/xididunix.pdfIn PDF document text
    • https://zitejapaj.weebly.com/uploads/1/3/1/8/131872087/wudamuturumemo.pdfIn PDF document text
    • https://riledigevaja.weebly.com/uploads/1/4/1/5/141506496/9475458.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/99478975012.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/59390489495.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 extracted file (font_00_sfnt_off0000f493.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000f493.bin)
🗂 Part of campaign: joshuadacosta.com 3 samples

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 17880 bytes
SHA-256: f707e27d18d40908ee0a36ca8748644ff6fb3a5220f940432ea1f09b074b9a7c
font_01_sfnt_off00012393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAA 11528 bytes
SHA-256: e70bbf68ff7dca7d455cdfbf22cb4be00754a6e87b76a1f7c45ac4cf0cac81ae