Malicious PDF — malware analysis report

Static analysis result for SHA-256 b603e68ba1e55744…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 18:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c817de3d7ba5351ccad83900d4a0b05b SHA-1: 933e3170e42db116d7b8c20a33e6dec960637a7a SHA-256: b603e68ba1e557448cf3d6694f8e5331a33b9cfae7d29db55443031f25c9076d
134 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of JavaScript indicates potential for further malicious actions, such as exploiting vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=insuficiencia+renal+aguda+pdf PDF link annotation
    • http://geonatlife.es/ckfinder/userfiles/files/61526423397.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/14903809615.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/70928660195.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/37047029469.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/somunabaxajononu.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/58846227952.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/wemokugugip.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1073b58f---livum.pdfIn PDF document text
    • http://e-sheremet.com/img/26424915724.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/83434070433.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/vevirafejen.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8a24221820c8e396c20a4bb383814f5a/gumijijixinuvogatusopete.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/92060781344.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/40785766525.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/83952015412.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/86540441923.pdfIn PDF document text
    • http://nemochem.cn/upload/files/saterezatatotojugonuzufor.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-08/images/files/pareb.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/totuxuxon.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/didumimofezaxivikaduloku.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/xuvebibevoluzib.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/41709515053.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/vopasixijurufizun.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_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 10628 bytes
SHA-256: 52b4097d3c68f44a417fc7fc3540e6278be558d7e57af6c7710979f987a1bbf5
font_01_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 17828 bytes
SHA-256: 0d2b719febeddce19b0a3e94fb9a9bb03dd1ec75c9ff96acd7f9b02b9e59909f

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