Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af442ef87f8267f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 01:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdda4124fc5024188aaf4e8269e2fcfc SHA-1: 1b2dda01deb89114be0383819fffb774fc92d864 SHA-256: 6af442ef87f8267fc6d6c46f2eacd25a92e4f77e455142d6c14d6f9c90f057fc
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It employs social engineering tactics by luring the user to install a browser extension or update, and also attempts to solicit sensitive recovery information. The numerous embedded URLs suggest a link farm designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://reparationmobile.net/userfiles/file/dolapesipededoziwuxafurit.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161478d0cb007d---pofasilubejumanuzi.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/8576889764.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/xejolow.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/7a8e0abecd1674131ecd55749fbaf5ed/wivotuwiwar.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/pisewivusoluzuperuso.pdfIn PDF document text
    • http://newworldss.com/uploads/file/54213368049.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/91524687324.pdfIn PDF document text
    • https://shiksha24.com/userfiles/files/64852766142.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/98857955843.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210903224916.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/ralatu.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210902172951.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/nuvap.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/58934361840.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/68364196805.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/korejuwisikizob.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/66219854083.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/nijexemekizurirulojurera.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132c68fe9543---40391075262.pdfIn PDF document text
    • http://willbramephotography.com/64398433742.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/79217961683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=privacy+pass+chrome+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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 18656 bytes
SHA-256: d67a9fee3ce4f99298d2b9dd22ac5a94f9b7a5dd9afb0504cd9596f6bdf30dbf
font_01_sfnt_off00010a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7B 10816 bytes
SHA-256: d8a8570b19a9aeddee55ea46ecd9175f97721f39577bc52812fc240b9eb6dcf7
font_02_sfnt_off00012345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1