Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a5ee729eb999f3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 13:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 91741c75e692f86503dc62063b60dc84 SHA-1: 8b55491da5f742268389cadf3a6d5a5317e449af SHA-256: a4a5ee729eb999f3e762c4a2f646b311ff9388e632f88577f6b737f752924f6b
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 potentially malicious or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are commonly used for phishing or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://interroadholland.nl/userfiles/file/65479849056.pdf In PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/luxijipidevurudivesofim.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/7100381026.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/30848965998.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/gaxivesifonulabuwaxebapal.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/96422643538.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/80951048963.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/kewijanumepiwexiwamo.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/zugozesabimamuma.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/45244787446.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/mikipupogupilofeveg.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/zotitibitaf.pdfIn PDF document text
    • http://thegioioto.store/upload/files/9242595711.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/53436056080.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/konozixusubazi.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/mowibiba.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/83354408883.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/36220864791.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/13004106340.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/gunelekunudexifub.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613700ac25696---84655875527.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/50715070888.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/74055667738.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/wenowekum.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/21705963838.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/sivap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=seamless+angie+smith+free+pdfPDF 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_off0000d3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DB 10900 bytes
SHA-256: 9c517bb04a74ba0586e8b5a21e7b0da507058a33c6f3519cf6c87189d89d52af
font_01_sfnt_off0000ec98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC98 17696 bytes
SHA-256: 7b8c0882da2b0539bfb24d5b8ca8d1b7210bce2b7d8c8e901f4ed79784ec159c
font_02_sfnt_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1