Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb0c0bf779120b2…

MALICIOUS

PDF

93.1 KB Created: 2021-09-19 08:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f045ba233a64cf20618f3a2ffb81fadf SHA-1: db2570c7e13492a7e7ffbb12a30ba0b0ac0e4c9f SHA-256: 8bb0c0bf779120b20f7e52dcac73839678c2ded719a648c53c5d245a89257a5a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The numerous external URLs, including a link farm on disposable hosting, suggest a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://oniceh.ru/uplcv?utm_term=list+of+english+language+techniques PDF link annotation
    • http://usateatop.com/_upload/files/wizagubif.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b47e7977f4eb13ccf98cc217dce65a42/wasikubaboluxodel.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5ba2725c---51890095231.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/mipajakigob.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuxomigujakitome.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/xupizelazonuxepore.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/bowovowotifo.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/begejovejozopazig.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/jinojezafexefobanexudex.pdfIn PDF document text
    • http://hidropro.hu/upload/14066603073.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/xuxutemavatazodufe.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/69080297454.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/38496172732.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/32203537118.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/lijogul.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/jadajezizuvoxataxew.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/75612503958.pdfIn PDF document text
    • https://2winit.com/Files/files/96787853847.pdfIn PDF document text
    • http://espokebar.com/uploads/files/52046593876.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/2484801102.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/minizad.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/35469862661.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/46278862243.pdfIn PDF document text
    • http://hnhappiness.com/d/files/divokakesaxowuguw.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/puzusajupudinenagi.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/gipitapobipakugoloz.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_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 17668 bytes
SHA-256: f094b4206e5fbb4a010a30bfd9b5218d089b3aec80ef6cdcc653c229035654b9
font_01_sfnt_off00013637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4E 10716 bytes
SHA-256: fb9c0fa481451fd60ed90f119e25748f7184885b583e66af757ce3dd19946981