Malicious PDF — malware analysis report

Static analysis result for SHA-256 3840797eb83ea0c3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 18:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f963abfde26343259b8928a5ed0eb9a SHA-1: 85230237c0b9ea2d9f67563c965eac7a2ed6374f SHA-256: 3840797eb83ea0c3603533f6ec6c296dc3555c277e5db5b285c521ae98456c01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to unknown domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://zakarpattya-tour.com/upload/12235254545.pdf In PDF document text
    • http://okuninka-biale.pl/userfiles/file/tasixudugikinazidoxos.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kk8shkdtfpi1fh77bgittc0vpf/lokelavaxurot.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/duvofakesikimaw.pdfIn PDF document text
    • https://onecre.com/images/content/files/ruvigogamir.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/29583293773.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/032218437765.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/24938250043.pdfIn PDF document text
    • https://landviewdesign.com/userfiles/file/benefigafuxopo.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/orafepixajedoz.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/79266078046.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/rebinuguvulozanutulamo.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/74956474486.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/87888979562.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/fifasawoselotoligiboluxas.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/nipebaxeloxisabifiw.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/guburatofirelimox.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/36993785300.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/12223193933.pdfIn PDF document text
    • http://leruichem.com/upload/files/77016793997.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/dipejuno.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/jadunevarabewipununafuno.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210910025454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=instagram+free+likes+trial+famoidPDF 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_off0000ddee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEE 18160 bytes
SHA-256: 0bc61f7809551d1e94071795366edec382ad9ed26ff3e9b0b6bac301a3ce35e0
font_01_sfnt_off00010d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001258d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 10740 bytes
SHA-256: 827b2658a34fb16c47616d6b44eed4b7022d36cc6675bbf35ce5da054e54da5d