Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb9a32c6bf5bbdd…

MALICIOUS

PDF

81.6 KB Created: 2021-09-23 00:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e10d0c31b43f82c7058b63bb785e0cd SHA-1: 5ebc8d9c0210f636610de746bb790982a5fcfbbf SHA-256: dbb9a32c6bf5bbdd8f420ed5a4aa31272331e7f322f2bf47b527bed7983d8f6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://nebovsem.ru/app/webroot/files/files/jixenalivowu.pdf In PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/nisafopirexokun.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/85538708563.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/66842211542.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/26200532219.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/zamopida.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/21069824470.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/mevilipidinirawurutiv.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/54936890952.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/64960664528.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/giwidi.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614050ef9bc6e---dubuzodabigafop.pdfIn PDF document text
    • http://rsentco.com/upload/file/95288502457.pdfIn PDF document text
    • http://ailizia.com/userfiles/82499706427.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/gewumowirik.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/gagapakamaxutizoro.pdfIn PDF document text
    • https://www.alliance-educationsexuelle.ch/ck/ckfinder/userfiles/files/10857083614.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/37986668124.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/makig.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/60153311060.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/welubelofaxemuponogudanor.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/12209692387.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/74354312666.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/takiwe.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/46925354191.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/direnipotevujiripurofus.pdfIn PDF document text
    • https://penal-garazh.ru/files/84684648887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+you+screenshot+on+galaxy+note+10PDF 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_off0000d983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19A 11124 bytes
SHA-256: 66c5fc6dddf319decb9846c042c335cde450885f14c2229e844d8094ccfab2f7
font_02_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 17572 bytes
SHA-256: ed436b28961ac84b7a6c57a16ff4db972cdcf5316cc4c8ebea1ffb7a985c5fb3