Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3ed8ada341ac4f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 07:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e15508238f25d2a0f0a6267093f30238 SHA-1: 0f94e8dd8eae5768ae57e1bf833cabc519a86f80 SHA-256: 9b3ed8ada341ac4fe42bfe3f88d2a2c3d123e20a3019dbfdabee514ce7b72663
174 Risk Score

Malware Insights

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

The file is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it uses a browser extension installation lure, a common social-engineering tactic. The embedded JavaScript likely facilitates the download and execution of a secondary payload, contributing to the overall phishing and malware distribution objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • 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://imagebuzz.net/ckfinder/userfiles/files/taxorebolesazufoj.pdf In PDF document text
    • https://ldoris.com/upfile/files/20210920070032.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/69828367956.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/82670163554.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/poxilubenir.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/41691129906.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/36966020328.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/80424367930.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161374b205b02a---90454130267.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/49306767985.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/16626074421.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/73503775344.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/wekiril.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/puvukotil.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/42522329482.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/dutivup.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/tafolovizuzuzarukenexenuw.pdfIn PDF document text
    • http://szwygs.com/upload/50326141591.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631531175.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/51259634774.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/8185083141.pdfIn PDF document text
    • https://upaspor.com/resimler/files/13902287984.pdfIn PDF document text
    • http://gensugroup.com/upload/files/wiluzufuwoladiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=transferring+iphone+data+to+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_off0000d2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BE 16696 bytes
SHA-256: c4db8252c244551252a230740df784cf31eeeff8ead9958d52086b089078223a
font_01_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 10696 bytes
SHA-256: 9d3906c40df81e6835d6d9b1133e7f5fa509eee9e15c3ade1ac3a42e20e27603
font_02_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1