Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a362222e2f6ab6…

MALICIOUS

PDF

114.2 KB Created: 2021-09-21 13:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c170dcf7b63cc5ff0e510fc02e7fd109 SHA-1: 376f3eedae10e157a65feb134c433b293704f96c SHA-256: e0a362222e2f6ab64d577d76783aa2fce7ff4fc75cca030215abee5f74773f09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, suggesting an attempt to distribute malicious content or conduct phishing operations. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=jogos+mais+populares+para+android PDF link annotation
    • https://10s317.com/uploads/files/202109110352032494.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/98598079683.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/danile.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/84511682286.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131584b0ee4d---laxiridozezetu.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/7691889777.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/1502096711.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/notukikizoverepekororoba.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/72213917836.pdfIn PDF document text
    • http://aa-nusd.jp/roxifujusoj.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/81483082026.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/fidosexosemiwa.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/15527995824.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/71066252151.pdfIn PDF document text
    • https://buka.ru/sadm_files/32218534978.pdfIn PDF document text
    • http://rurisnet.org/images/file/31041052339.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/86787479957.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/bilokugivubezurufodefafu.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/fiwajadunepivafegunu.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/teposexelo.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/94763179438.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/weratan.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/sepexatategowegobasina.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/73055276125.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/mewijokapiredetifotiko.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_off0001525c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525C 21600 bytes
SHA-256: 65f7348025dbe72114dbe2b53348565ae86b659ee2e21ff7194c055346a7db94
font_01_sfnt_off0001888a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1888A 10728 bytes
SHA-256: af4f5bedcc0be4011caece6fe2fecbf42d00a44eeb7e642de8571f69d5770d44
font_02_sfnt_off0001a0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1