Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef86b6c47bdece1…

MALICIOUS

PDF

74.6 KB Created: 2021-09-15 16:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5c0a020bb50fa1ee7130928196fb4eef SHA-1: cf9671b0eb855fa44b74e0b6a1fd77d82ffe1d9a SHA-256: 3ef86b6c47bdece1ddf3029f8d57c456cafc3d69c8b344c12ee6f092d5289c28
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=android+messaging+on+windows PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/skae02ch0vlojull2rkjhrmn92/pusoxubosewuvezarek.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/lenefufinuxoke.pdfIn PDF document text
    • https://haidangpc.com/contents/files/33332553507.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/35544230449.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/talijowovisigowupowadoti.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/novirogategadavaru.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/31761122839.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/diwapeg.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/rupam.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a2c35b2826658e9ee88c691cd3f73da4/27739351428.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1630671326.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/66155589014.pdfIn PDF document text
    • https://asi-filter.pl/files/file/10856754830.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20903836217.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/xupiwisusexebotazonad.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/warodawelu.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/8995464510.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/kupojipunutidelax.pdfIn PDF document text
    • http://twilaw.com/files/files/pinebetegekumit.pdfIn PDF document text
    • https://quizai.com/uploads/files/43511209447.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/67471433135.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_off0000c2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D4 10516 bytes
SHA-256: b90d06d23736cfff51157393bb6626014c3233d0996ac28ab1c7302089e02a0f
font_01_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 16428 bytes
SHA-256: c281597a89baafcdb789f898495ff204a46f4121575057316242410eaf4c1abe

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