Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb139c5fa0db531a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 08:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b6f5143ab111ae6c2ed4df3006966d01 SHA-1: b44a68a46e222759d4db0b8fddd418f13be551e5 SHA-256: fb139c5fa0db531ac18d468f94b974e2f04a7624ebea3d264de0925833f047d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. Heuristics indicate this is a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, likely leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f40188c4e---dowumodutapajatol.pdf In PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/37367988948.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/35259970049.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614045b308718---sulutelakakopej.pdfIn PDF document text
    • https://campermagazine.tv/public/file/joxesil.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69470814161.pdfIn PDF document text
    • http://intertribo.sk/files/10847264332.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/gofebawib.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/76185975721.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/luruxopemelito.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/keraka.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/xuzibarujokirekaw.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109070200599530.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/waxipate.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/ruseselotakisero.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/8271358422.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/jataxazanalolug.pdfIn PDF document text
    • https://quizai.com/uploads/files/81928323656.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/mafimasufu.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/44674639731.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/paxazubopafotexora.pdfIn PDF document text
    • https://actor-conseil.com/files/file/jepuvexakeximevaz.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/wesowutimoj.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/94765348664.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///kikudimafutanovozen.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/fijofefewubopugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=nanatsu+no+taizai+watch+freePDF 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_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 10608 bytes
SHA-256: 4303f8074c59fba6de74ecf30a84da69cc778d60a2c0beda1e54c4511efc44f7
font_01_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 19192 bytes
SHA-256: 901add127532135f7000c7f98d00c84b78bb9751a6c784d418380ccb44604395
font_02_sfnt_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1