Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb52c35ca855f2cd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 23:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 91e6381c02f0fd2577c28d1173b32031 SHA-1: 25362c992a5f261036fedcaaf6f3ba4584d4c5da SHA-256: cb52c35ca855f2cd107eb69cb8c6405cea6d1678b5c48d9cccf12a693139388d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of external links, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://rayanchem.com/d/files/xaludaxagimimezopeni.pdf In PDF document text
    • https://pfollowers.com/ci/userfiles/files/ruvugutanawa.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/nowakapelikopusukewurew.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109051745238014.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/pevuduxiwisofekigareradog.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/44484117010.pdfIn PDF document text
    • https://swiz.eu/files/editor/65028916009.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/zewadepore.pdfIn PDF document text
    • http://hkwwta.org/userfiles/74001722826.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/06/69021600410.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/83526978672.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/33263329306.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/55865556518.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/xaletogap.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/jakifivuzerixi.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/fopavuj.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/41906537502.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/37191183282.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210910123241.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613101d73333d---4348232473.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2d6dd21b2c7d49a7c27ad3331b6ef217/34889979997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=navy+seals+david+boreanazPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/nazageposofagekibeline.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_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 17904 bytes
SHA-256: 9f49892e82469f94051e7521faccc9b8f3b129c734ce51e61a186c875da41a4d
font_02_sfnt_off000123f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F5 10500 bytes
SHA-256: f429d93595dcb42d9aa4eaeb52fbf59e5b28d9319ff4e835d39f4b66e6fa93a1

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