Malicious PDF — malware analysis report

Static analysis result for SHA-256 02cbc1151416b646…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 18:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 738bbbfc9257b9023df5e4a4c5fa760c SHA-1: dae13244d72e8149f7d72cbd07f91f19c6240141 SHA-256: 02cbc1151416b646ce8e4b98b210480658e9542d88101c43f6a8eeef5bbf6663
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The document's structure and numerous external links suggest a link farm designed to trick users into downloading software, likely malware, under the guise of activators or other tools. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=kms+windows+10+activator+download+64+bit+with+crack+full+version
    • https://fong-cai.com/upload/files/91390380247.pdf
    • http://sake-tori.com/images/library/File/81647662808.pdf
    • http://apex-architect.ru/images/file/wirexusuzizukogubi.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/tesaradurumalavibifaved.pdf
    • https://maychieuvinh.vn/upload/files/dasojut.pdf
    • http://wdnederland.nl/file/dezefada.pdf
    • http://vipforiraq.com/userfiles/files/80861141470.pdf
    • http://irths.com/upload_files/files/rewuxapaved.pdf
    • https://rajatotogroup2.com/contents/files/lifosibitupobezavepabiti.pdf
    • http://happinessgown.com/upload/users/files/427141490.pdf
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/dekotakosutakamefag.pdf
    • http://szakkepzosiklos.hu/upload/file/fulorumev.pdf
    • http://uleshuzatshop.hu/files/file/39676680082.pdf
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/33757233805.pdf
    • http://gsemilia.it/userfiles/files/mebatomupugavulomopaluxo.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/711284240.pdf
    • http://tractortools.cz/ckfinder/userfiles/files/5006666530.pdf
    • https://easresidence.ro/app/webroot/files/userfiles/files/zuker.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf8662743---getuzowekudoxenikovab.pdf
    • http://sga.cc/uploadfile/file///2021092305473391.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/puxisotoxarepijuvi.pdf
    • http://indago-rovigo.it/userfiles/files/21131920046.pdf
    • http://bigbulkbags.com/survey/userfiles/files/58158598614.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_off0000b147.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB147 16792 bytes
font_01_sfnt_off0000c959.bin
58ce5b80f12b52bc3637708ca1d2694536a27577f41a9790188c98392d0aae12		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC959 15404 bytes
font_02_sfnt_off0000f054.bin
4077c980e12c9df46c6421d62dc3490aeb2f31a0cd03cf035b305156500ced58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 11636 bytes

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