Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bc7bf4be10282d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-27 09:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1c1edd64ad4af9f5dabb373c1d105a4 SHA-1: 816ab1feadf25f54211ec3bac17baba1eb2345d9 SHA-256: b2bc7bf4be10282d4b5a03d0924e4818b8b2ca3ac18b4c5dcf3bf245e1c8efce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=life+intermediate+student%27s+book+answers PDF link annotation
    • https://webaruhaz.codefon.hu/js/ckfinder/userfiles/files/66065767847.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109100008369781.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/34306529473.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/94317492887.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/tasewelen.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/kojirukegexibuxafegufo.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210923040707.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/64853544869.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/fosoloromamonufadodopaz.pdfIn PDF document text
    • https://datenglagi.com/contents/files/zetubusevaduzutipofir.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109231423232410.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40412732487.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/67073890878.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/kimofiderolamopemo.pdfIn PDF document text
    • http://dfanchem.com/upload/files/tuvokutawokapolazonetex.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/13731302734.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/542141027.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/tafepaxosi.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/45687597850.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/pufijunubigiwat.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/wokogazerafejedokuzute.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/75601275728.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/df3593b84db905e651e231f0e146439a/92496463608.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/60522973000.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210910_725BBF95F61B743A.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_off0000b3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E5 10876 bytes
SHA-256: 232f8f4e8d999b427e6a4aa5641484d704966a9c276b516ebb085b76c57bd8b6
font_01_sfnt_off0000cd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE537 20136 bytes
SHA-256: 110d563466d8a407076d5e6e5ab2368f90c4caa9ec8cbcdfae7e49886c51c957