Malicious PDF — malware analysis report

Static analysis result for SHA-256 84926273bec28584…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 05:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bbe74d5688441a07c24d3067967f73a0 SHA-1: c6817eae53c11b17f3519ef963777e94996f2b2f SHA-256: 84926273bec285845918d6fb41ea7e38d748ce1f64b83509f7fa696bacbe8d50
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection or phishing. The presence of JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://smidgel.ru/uplcv?utm_term=jumanji+movie+online PDF link annotation
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/41612785437.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/nuvasigibenufuxoxa.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/gadose.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/66824657666.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/195383135.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/siduxovepipederanuli.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/24843472659.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/vamidevidized.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/pupaneginunudegutikiguxa.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/34140405674.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/4741695147.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/xagavafet.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136f4afe725f---29212047388.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/39014289007.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/lidejurabu.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/fezifukiwulerabufuj.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/xulepexo.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210914_170213.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/19408353872.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/15960421163.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/lexapaxumugemoja.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/23319067669.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/29216619894.pdfIn PDF document text
    • http://erex.hu/upload/file/nudusun.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210907011652.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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 10188 bytes
SHA-256: 7cb22ac0d0a76fa4121e6757920f729c0fa4a7ffdfd49662d79cf38273ea500a
font_01_sfnt_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 17304 bytes
SHA-256: 31df7a7881ff4db6d843905b64bc6cc7bf77880aa7d28bb11af3dc32d8eebc70

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