Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3559b9dd91df582…

MALICIOUS

PDF

84.7 KB Created: 2021-09-22 12:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3065e74cf49548d61c71e3af61c0ca5c SHA-1: f8656950d014f3f7309a70405d3e438e2809e089 SHA-256: d3559b9dd91df5822b3fdbed608ade99dc2182e915fa3c39d8aaeb5806e9c082
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to redirect users through a network of disposable links, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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://novahealthclinic.ca/userfiles/file/43181640796.pdf In PDF document text
    • http://vesimport.ru/userfiles/file/nowitonololezimizag.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/61371592800.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/rasazaregonale.pdfIn PDF document text
    • http://sjanzee.nl/file/vibodidototiboxoriniki.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/70447888853.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/4820170894.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/zuririvilazofusef.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/43036169767.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/57973359841.pdfIn PDF document text
    • https://majubesar.org/contents/files/muturexixab.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/laroboleninajoz.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/51141566280.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/todab.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/79952899162.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3f502cf6c---mogojifegizegapirumi.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/rujim.pdfIn PDF document text
    • https://kstraders.com/userfiles/file/mukup.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/2974602890.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/4255098665.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-19/20210919175554759864.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/dotizelizixakazuvomom.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8c8a9ed1078aeaed2b2d0a1a3d5e33b9/81805672419.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/mewopexax.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/lusilije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=enterprise+applications+are+useful+forPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/kakowaru.pdfIn PDF document text
    • 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_off0000e409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE409 10556 bytes
SHA-256: 885285679158516fa67fb917baa26e7d04a1e15cc4479e5337d3cd7105bb3848
font_01_sfnt_off0000fc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 18556 bytes
SHA-256: a86551226e985bd73c4254a42533bce35f156c0b5df32dc255eb34d0daff4912
font_02_sfnt_off00012cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1