Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbd7b094d635652…

MALICIOUS

PDF

89.5 KB Created: 2021-09-15 09:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6779a8f7092695b108b7fd0437563b26 SHA-1: 768c203e15a35dcf9fdbeadaec7443c97c0ea2f9 SHA-256: 4cbd7b094d635652715c21cedf83a67869ea1b27dae63b718362d8dda3677371
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=croods+2+stream+free PDF link annotation
    • http://print-resource.co.uk/ckfinder/userfiles/files/86601813806.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/tapuzodegijajejedur.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/17965459294.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/rebunufoxozerukatibo.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/tosomemasubopizumezav.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/15039950077.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109110213204423.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/11161356232.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/39954616190.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/357150669613a5ac4f0eea.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/suxewavotagukibudegoxade.pdfIn PDF document text
    • http://vladekoservis.ru/files/85762726271.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/99147985750.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413bd942214---wajovuvovonex.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631457437zanetatusulezat.pdfIn PDF document text
    • https://fishboat.hr/files/junalojuzu.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/94967098700.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/guleruvemux.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/58217979608.pdfIn PDF document text
    • http://ad.ditroinfotech.com/laportal/ckeditor-ckfinder-integration/uploads/files/12969420048.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/35635026439.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/duxoxibobi.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/motosi.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c1e53a613---romolesodalijalaf.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_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 18484 bytes
SHA-256: 80c641700c950a67721d7d38a4f686edbce0fd4633dc6aedf3b6a123354c19f1
font_02_sfnt_off000140a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A0 10424 bytes
SHA-256: 3ba22721b9eb48fcf5f39a487ad8c28bade2f921f35aa30ee4e6ec481332e8ee