Malicious PDF — malware analysis report

Static analysis result for SHA-256 769d32560e13f966…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 17:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ef63eea5526ccad6b668c925e940c255 SHA-1: 9e97aa4483a95730aadb10c9fb23ff00858ae2a9 SHA-256: 769d32560e13f96607468cd7a04a650d1c21cfa4b4664df73ee9976e846f6ce4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous extracted URLs suggest an attempt to redirect users to potentially malicious websites, likely for phishing or to download further payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ukmalayalamnews.com/userfiles/file/rudufupaxurowax.pdf In PDF document text
    • http://allier-genealogie.org/File:/fubikameganofaselal.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/34935912491.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/sumusadalivegop.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/xakakoxoneramewozefose.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/sexazigomusamu.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/bobofiwexakuvetavusok.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161349d41df42a---vabapadijinimunu.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/33170463436.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/soxivevat.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf0422f23---79016298447.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/xotiwi.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/zisirakujogolox.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/18536303819.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/nitefijirinagupozez.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/sixib.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/dukimasisu.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/84204710413.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/pimosimuruworonifusev.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/widipepaxugebomix.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/defivuturip.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/57752433471.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/7983514324.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/butizu.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/11545490652.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=sair+modo+seguran%C3%A7a+androidPDF 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_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 10820 bytes
SHA-256: 56f4fa17240ed129b6743510f423e64a4c39eb3fea49e2e88a5112c26073306f
font_02_sfnt_off00010bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB1 20340 bytes
SHA-256: 4766ab4280a03699e726d9d0e9e018f72ef59eba0fc681f27d69d30773f8f5e1