Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd87cbf72d3969c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 19:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 941c2599505825ea4cd800158111adf8 SHA-1: 48c8779ef99f5b5a0f4895fd1b13bbf514856807 SHA-256: afd87cbf72d3969cedbfca24862a973a5add2eb2632c263bb3bb51a385fa3acd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using many low-reputation domains to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=apk+mod+gunship+battle+helicopter+3d
    • https://nadrozmerne-sklo.cz/uploads/79563380695.pdf
    • http://hcvitamin.com/webroot/img/files/43179436245.pdf
    • https://dancleland.com/img/upload/file/38722909284.pdf
    • http://galsabino.it/userfiles/files/vexemo.pdf
    • http://dogwarts.ru/sites/default/files/file/41543225698.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a32bdf89e---95467626862.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/mopefesowokiki.pdf
    • http://agcslohian.com/userfiles/file/ruvesituwuni.pdf
    • https://clubslotalmatriche.com/calcas/file/fezubenidelodukuselaxe.pdf
    • http://tecresconsolidamentorestauro.it/fck_data/file/tovopimufuwuz.pdf
    • http://dh-cell.net/ckfinder/userfiles/files/68769728086.pdf
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/27832178879.pdf
    • http://jualumnitoronto.com/editor/uploadfiles/dizodokote.pdf
    • https://khangle.vn/uploads/images/files/mipojolakavogusanifigunid.pdf
    • https://vibingvibes.com/userfiles/files/funewinokomonovizeti.pdf
    • https://biocoils.com/img/file/tasizifenanuw.pdf
    • http://esllearningbydesign.com/app/webroot/files/file/7325652990.pdf
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/43316680776.pdf
    • https://stvietnam.net/luutru/files/kegusafateriwusojoman.pdf
    • http://rafaelokazakov.com/file/34240427502.pdf
    • http://toitureetfacade.fr/data/Files/44013084910.pdf
    • https://fullmagicweekend.com/ckfinder/userfiles/files/67905618448.pdf
    • http://beming.com/ressource/site-image/files/56016463277.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161445e68c37d7---65992681126.pdf
    • http://hytechplus.com/userfiles/file/35040559490.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6fa.bin
0704f2687300c3d93c5ccd336fa5fc626f52ca4388c55235a37078c806115c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 11448 bytes
font_01_sfnt_off0000f16e.bin
2c4a37854ea107aa654479361c78aab944be1cb234b663fae5ef5bd1012767ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 17916 bytes
font_02_sfnt_off00011fa4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA4 16792 bytes

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