Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc7dab3e61fb66f…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 08:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96b1543c015a1d2ca811b12e69a19d8a SHA-1: fd84a67173bbfebf4b32fe03c45719fe0663aee6 SHA-256: ddc7dab3e61fb66f692d5402c7f64a66957bcd1f5c2ddfaa7bd0f0fd82b0aa59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. While no scripts were directly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://centreforeffectivecoaching.com/media/file/91311748384.pdf In PDF document text
    • http://hyunshin.net/userfiles/file/mujowutasowadulosenawu.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/40556748819.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1f4a9f85---67623106984.pdfIn PDF document text
    • https://norservis.info/files/files/48237841427.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/60407632719.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/38028267360.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/pejekijizurijivedojulugit.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/31862266037.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/91122693433.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/bolopojimasik.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/20987574583.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/jususubasafod.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/mupepulolelilot.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/63871552966.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/vinozitepenatoj.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/tadabigupixo.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/69026747448.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/46cb8f81497d94e0e7db0b7d9ce3b12b/kudaresemofemijeloxuv.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/kunajisoses.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/moromametikubeg.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/89282542019.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/62429094992.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/kumaril.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/tojenopexuvor.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/88117845391.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/boxenatepuzimopowow.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/46875214570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+site+to+watch+marathi+movies+online+freePDF 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_off0000bf02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 10808 bytes
SHA-256: 2fb8525c694a69ed18a9dfac491527531f1dd5ccde873f65de3e7dfc93216931
font_02_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 16024 bytes
SHA-256: 515727c6f6b710daf9091c51cf9c1ca5c96d21ec05957ccbdddbf13d93a3c40c