Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68343c7fc229a43…

MALICIOUS

PDF

86.6 KB Created: 2021-09-23 04:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 063f66941f491643b62305a33b0efd1a SHA-1: cd4cff2c4e28c6959886b35ae24629369a613ae4 SHA-256: b68343c7fc229a43113c9dcd2178da811ed3ea12f8a44c0bc81cea92aba23148
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded links, many of which point to potentially malicious domains, indicating a link farm or phishing lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://tahi.hu/ckfinder/userfiles/files/fuxawujoluka.pdf In PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/74608739326.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/52735563689.pdfIn PDF document text
    • https://tebra.si/userfiles/file/najimipovufomeporakufulaz.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/nepalozasogubosimupol.pdfIn PDF document text
    • http://www.heksan.com.pl/file/gegogutovinatejavonabiwof.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/sudogabidufofemupaf.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/bevuje.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/82098388277.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614199da6a41f---77981202736.pdfIn PDF document text
    • https://umutfm.com/resimler/files/22814639599.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44999266196.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1630517374228930988.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/weboxisapozepuwar.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/gulewutevaza.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/34260106704.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dc682deac---wepafimupopam.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/44412680636.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/60781997205.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/runusoxivuxafexipusixe.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/riwewoxofenejana.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/kaxezarafexanerer.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/tefoxewelimuzujodatoboxa.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/16682213901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+close+app+after+timePDF 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_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 17180 bytes
SHA-256: 98e2b35cbc80f3c15fafcdb45336f6c2ba4a2b2abbfe08f22b9fdd77cabc1b0a
font_01_sfnt_off00011bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13403 10760 bytes
SHA-256: b812649f48c8f1768dad45dea73751a180005c800853a69cd84d19c03dfc81c8