Malicious PDF — malware analysis report

Static analysis result for SHA-256 0024b52991c30f3b…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 18:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a41d30cc38dafbb4f72db757f6920d5 SHA-1: d7206c14d253114825e6fba891cebf0a2e5af653 SHA-256: 0024b52991c30f3bfb382c6476484f0ca882e5210d9518b5bd2cc7886e6fd32a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URIs indicate a strong phishing or content-scraping intent. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=how+to+visit+dark+web+on+android+phone PDF link annotation
    • http://asia-test.informacittadino.net/media/files/sapoverera.pdfIn PDF document text
    • https://12shio1.com/contents/files/99842155763.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/2133950973.pdfIn PDF document text
    • http://fjsxsx558.com/upload/files/zoroz.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/duzesekib.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/52695075379.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/52569067599.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/judemofuzobumubera.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/95602900611.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/27792116031.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161403dbcecac5---judodi.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/161362f3b8e383---renurijabisabedokewekek.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/65327531558.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/22466315446.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/5585100846.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/79913632654.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/53563440200.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/bijoxotutibegototami.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25317220550.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/memapiputediwu.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/fekurema.pdfIn PDF document text
    • https://blogsma.com/files/loxudememonebirulimul.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_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10629 17620 bytes
SHA-256: 73ddfe368210b5fea84b0a2fc2ac77798b64f882ae49509b1716fe7a16926d3e
font_02_sfnt_off00013440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13440 10820 bytes
SHA-256: 9d9fe651579648020823074b03f7adb56bdd90957a6156ea6615057713f521ad

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