Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3f9fb2f03008b6…

MALICIOUS

PDF

86.9 KB Created: 2021-09-20 13:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 285a878dfb095accac34be16b661a29b SHA-1: 3eed79c75fa4f972f42d106a1ffa3f237689970c SHA-256: ca3f9fb2f03008b649479e56660bda75390fa13387b0e9208de64232f82d127a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be link farms or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the PDF is designed to redirect users to external, potentially harmful, websites. No scripts were extracted, but the sheer volume and nature of the URLs point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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 https://oniceh.ru/uplcv?utm_term=one+piece+offline+games+apk PDF link annotation
    • http://e-instar.com/userfiles/file/83120479115.pdfIn PDF document text
    • https://path.mn/userfiles/files/lumagafixufokurujuwe.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/7803976753.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/kigalifu.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/purexiterulimibomam.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/63532233235.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/bepevorejewoteragezex.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba37879712---sobil.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/89961124179.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///13492867454.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144fd934f660---jaxoguvo.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/68670152158.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/futivupapivaje.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210912_212912.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/60923960013.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/35459732082.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/71935599511.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/lojigomisid.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/xowalixopevekilusel.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/89395759161.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/lufisenakivudukat.pdfIn PDF document text
    • http://teresachild.com/upload/files/nonebigumuxuvoxomit.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/fobijaloja.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_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 10744 bytes
SHA-256: a536ec6791f1bfc143c4884cb294ec1ed2af411d39ccf35c576e0ad0f3de4881
font_01_sfnt_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12163 17168 bytes
SHA-256: dbce3d6c87ae9b650690bdd3f043b81cc70f227b739100424946f5ab9531893a

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