Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee78e0b4c6457e5e…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 13:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ef2120fd92b917cf9c4e73a5c1af9ea SHA-1: 14a1fff6511e2a2bc9e000f3a23d5138f9d6ad59 SHA-256: ee78e0b4c6457e5e56c7f86058c8f723d1124fb650422adfe591c11860e2c92e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://businesslife.com/content/files/jefugaxejojuwijiva.pdf In PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/xivuvemovupabepenugos.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c47ba8e3e5---80376119979.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/xozafopekowo.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/bilunamizonof.pdfIn PDF document text
    • https://dm288.com/slicice/file/37337295282.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/29169200673.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613d854952688---89669529582.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/newafuj.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/fazuxaw.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/jevenadoravekopisuwiropat.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/33520240993.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/girasowaxanelan.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/besizabeduworibu.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/51842194654.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/wigidumewujadag.pdfIn PDF document text
    • http://belv.ru/userfiles/file/15593548379.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091909090480554.pdfIn PDF document text
    • https://aayams.com/userfiles/file/16949526420.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/xiruwipevijadonaxuburabi.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/96758752916.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/rinupoziwakuz.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///7628073413.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/fipudofekaxekaliniron.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/xomivasomexixebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=my+free+zoo+mobile+mod+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_off0000c7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C5 10688 bytes
SHA-256: 17709229f156edcd8be00e68734dc7afc009f4e3837c0bced98edb261f23ec8d
font_01_sfnt_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 17876 bytes
SHA-256: fef54c2a9b5b933388ec9348edcac7793625fde6008d54afdb8c666e446fa82c