Malicious PDF — malware analysis report

Static analysis result for SHA-256 4248249bfde94661…

MALICIOUS

PDF

76.1 KB Created: 2021-09-11 11:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0aef0fe55f0494464a47c36a9f4c25ee SHA-1: 4da4edcdd7f1e6072b6f3827bafda44e8416bc92 SHA-256: 4248249bfde94661e17669ff4436543be6b59a5c4f84acf43aa2918c2bc0420e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external PDFs hosted on various domains, many of which are flagged as disposable or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mimpiindah2.com/contents/files/febemuvuwewotoxobikozeke.pdf In PDF document text
    • https://megalightgroup.lv/uploads/files/81404399629.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/35003121611.pdfIn PDF document text
    • https://campermagazine.tv/public/file/506393630.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/xisiwinulakusajude.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/zanomiwejewejujetu.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/rafodikuzimosor.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/xepegiroxorijov.pdfIn PDF document text
    • http://myslizdrave.com/soubory/49726143989.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/64363606013.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/miveginuxotusewonaj.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/91029303190.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613684d491fb1---23115087697.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210903194321.pdfIn PDF document text
    • http://www.77ice.com/upload/files/wejedenuxitikigavisez.pdfIn PDF document text
    • http://tdbm.vn/upload/files/netufel.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/dibuburesagumasoxamozateb.pdfIn PDF document text
    • http://protok.pro/upload/files/zasokavesi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/batit.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/10595522023.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/xijopifu.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/jodaxuruxivagewuw.pdfIn PDF document text
    • http://klinok-saintp.ru/files/defuzap.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/38985044394.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/evnvl6i6pqt16oicfnrhe8atol/76540630402.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=five+night+at+sonic+apkPDF 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_off0000c1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 10644 bytes
SHA-256: b159bb653ff03c615e52f13042dc719ce562597e71d647cf793778072a0552ac
font_02_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 18576 bytes
SHA-256: 303eeeb475cbfc4a9826aa85fd643446a8c9e1be3d5284c9917a442332a7f8dc