Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e27e89bcf41d6a4…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 16:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 22f10bb1e25b8a2a963003a69e72cae0 SHA-1: 1f8dea0785a82e31e788dca0516b1a884c8e3ce5 SHA-256: 8e27e89bcf41d6a41bb4508cbd3d63fed2dbca8457cf6b5b81931f3ebd8ca40c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to disposable domains, which is characteristic of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of many unknown URLs strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely serving as a lure for users seeking game mods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://simp-q.ru/userfiles/file/fodijivemedixefanefav.pdf In PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145d8b27bd4b---vefobugevemamufumami.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/99022142900.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/79264896749.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/61642305834.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/2035592732.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wesapuxolujudafagifo.pdfIn PDF document text
    • http://haai.org/upload/file/92665997226.pdfIn PDF document text
    • https://digireg.ch/upload/55991539740.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/sipus.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/bixama.pdfIn PDF document text
    • http://cpils.com/userfiles/file/pujexatowufinifonafutoli.pdfIn PDF document text
    • https://euchebnici.com/img/file/22404561776.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/bawiwelamugigozin.pdfIn PDF document text
    • http://mousike.it/img_ins/files/60331231758.pdfIn PDF document text
    • http://ruihuitax.com/files/file/89569407600.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/sawoxiku.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16136c6b6d5069---88869491453.pdfIn PDF document text
    • https://krossi.ru/images/content/files/juguxotikabuvupipim.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/fitajenirubomuwaperolaru.pdfIn PDF document text
    • http://sz-frp.com/pic/2021092211344936.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/77668327070.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210921031226.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/xanodaxeguwodikiwomafopon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=shadow+fight+3+unlimited+money+mod+apkPDF link annotation
    • 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_off0000b1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0E 17308 bytes
SHA-256: 6f612f9921a08b3135714be09b3faf5745c10ad6ab7c8e09c7d26d99ed8b02fe
font_02_sfnt_off0000f6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 11316 bytes
SHA-256: 1a2cdbc429f3042df9f5f0b9173e626c3bc0110aa51e7a8ad2981932605a9538

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