Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d8234d4bc87af4a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-10 03:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fdcd10361918de92fb8ccb32921e22d0 SHA-1: 14bd8c1685a5842e5b4b6104d51726471b3adf3b SHA-256: 8d8234d4bc87af4aa9c7023f87633ed2ea9cfba2336900b68e818adefc7c2e49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://otestmanager.com/club/data/userfiles/file/20210908120344.pdf In PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/17609833380.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/11206896542.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/veruvosujazevor.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/goforidalofujuvagezawa.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/rulux.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/87530675420.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/bigipovolo.pdfIn PDF document text
    • http://rc-modeller.se/images/file///simuxodurobokitavu.pdfIn PDF document text
    • http://briztravel.com/upload/files/36818635021.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/nepumusiraposob.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/nakutelegakurasoguzelipob.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/3286186429.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/t8p56hrjquqrmi2jag8cnmkc9j/bevisomukazumodit.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109091209039216.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/golodanisegu.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/22004407816.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/7154543379.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/57937731554.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab9c46911---rugoluwiditedo.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/dowekizumovil.pdfIn PDF document text
    • http://hidramaco.com/files/files/dezazu.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/sosatosidajel.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/73564643287.pdfIn PDF document text
    • http://bushurov.ru/images/files/budumaduvenedosimomorelon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=steam+emulator+androidPDF 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_off0000b5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE06 15964 bytes
SHA-256: 0b746aa05a241233f6eec768ca0a7ae7afe09c6ac3502e328946346f9cb456c5
font_02_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 10416 bytes
SHA-256: 1fad80d2d70767c13db9c8aea6c5370a44af3f65310253f87701442d459695f2