Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8ca2125c2b0a8f…

MALICIOUS

PDF

68.8 KB Created: 2021-09-19 05:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2e920d8807816881d7b277c571eb770c SHA-1: e20f505ea0ed1e9250f4d490d1955531d03fbfd3 SHA-256: 4d8ca2125c2b0a8f820bff6432736b35e3822a63d07a6ca02f9824b10b4ac04e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file hosting or user uploads. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pixomot.ru/uplcv?utm_term=how+to+download+books+on+android+tablet PDF link annotation
    • https://implant-drill.com/userfiles/file/51185221658.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/bizod.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/17319656536.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/xitoxunu.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/somozuxixigolexun.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/xadobovazivarijumuvipo.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/80416843764.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/jadukovumaja.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/dikufazokate.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/41149749991.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/golirefafonuta.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/36856760046.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/74138575878.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/xopafoxidulikidopinomela.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/89156990323.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/233963674.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/15531160864.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/49394207362.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161468a1ee1304---zuzawexodotoka.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/mififopod.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/72662998785.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/64849089448.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/71917664902.pdfIn PDF document text
    • http://nemochem.cn/upload/files/9520651494.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/14539447464.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/f6821df8b8ea5f21cc2c602aece30180/dujopesamapisitatok.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_off0000b0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC909 14316 bytes
SHA-256: 1f7fdf9425f5000d79c7f4745606f7e1c3d0f4e9fd41682ff9034a5b7c6a9026
font_02_sfnt_off0000ecea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 10552 bytes
SHA-256: 96aeea48c73cb675d4869be7e1cec729003c327704fc19457341d297cce8b62c