Malicious PDF — malware analysis report

Static analysis result for SHA-256 c121b6762f3c0a88…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 02:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2889c05a3c8f1d2cba95cc9b65c1b8c1 SHA-1: 01a05cb629032b91a34dc23ae1b54a6b67508fca SHA-256: c121b6762f3c0a88aaa81c9863aff007381054f84028c9fe78296abdad6a8b89
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://archism.ru/uplcv?utm_term=heroes+of+dragon+age+apk PDF link annotation
    • http://cabanagarden.hu/editor_up/xutifa.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/31963135627.pdfIn PDF document text
    • https://aedwea.com/upload/foto/sesulev.pdfIn PDF document text
    • http://fructusartis.com/i/File/fifolunoxapufinenimoko.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/10966302387.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/sakojizuduvisu.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/kubipa.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/tinesidemusizijato.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614159180b9df---xuzozo.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/52577800244.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/nejaj.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/rumujuli.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/fikinuxuropu.pdfIn PDF document text
    • http://sweethomedelivery.com/ckeditor/ckfinder/core/connector/php/uploads/files/16666414033.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/39734318767.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/tozepogewamas.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210902/files/20210902055318.pdfIn PDF document text
    • https://ptogel1.com/contents/files/56131915950.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/vokixomujiwakesekejak.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/52625947722.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/zelupid.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/34361608696.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/52310821287.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/vewodinomasukebitosarobu.pdfIn PDF document text
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/78348673740.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f88cc85edf---parajojuxuwugevukusudar.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_off0000d4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A0 18400 bytes
SHA-256: e968f70a74aaa64616133beaef26317eea3f6c20e46ac7277387111eae2f0c93
font_01_sfnt_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 10520 bytes
SHA-256: 107f7b5b833693361d89f924b01ccd92db8fb01d02a56701d63964c76cf1e623
font_02_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1