Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3345d9daa0da5c…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 10:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f2f09d88da525c7e0c72fafbc593f7d SHA-1: edd38e8cdc009289f83d75e9ca23d98fce7cb37c SHA-256: ce3345d9daa0da5cf3fa80663a733cca6ea0885148a8fcd2d41be196aa96a572
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and external URI firings point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 5

  • 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.
  • 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://norservis.info/files/files/26631660735.pdf In PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/90044571233.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210901210902.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161397b98acf91---bedupegaliteniviripitif.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/rakezujemiwi.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/50350376426.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/23041699726.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nibarisinixubirapixofa.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/70ivtjtfq5uot7f6sjtigg4ec1/zuvuz.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/68617930290.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/49355418714.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/vufixatovolawitibul.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/86685773337.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/zigovelefujuwif.pdfIn PDF document text
    • https://cargotavio.ru/files/file/tarirakotexirigaz.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/36121440091.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/sarab.pdfIn PDF document text
    • http://rivucota.com/upload/files/1852756137.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fuzozokekanewoduvunuforej.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/52336788384.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/78413529407.pdfIn PDF document text
    • http://mutitar.com/user_img/files/gexibozuxilebobutatuviw.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613271761a860---23967414996.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/78388087195.pdfIn PDF document text
    • http://teknis.it/userfiles/files/64105636572.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/xobodexazenigipowega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+legend+of+hercules+tamilyogiPDF 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_off0000b8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A3 17924 bytes
SHA-256: 276e381f8da8fdf1bbf5e7905659a675f844b7809fcdeefb7e8f2f2d5d0a5b70
font_01_sfnt_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0F 11100 bytes
SHA-256: 5af124be24172bba8434fa201b640592f389ca1f2b6866adf6dcd5e916a83512