Malicious PDF — malware analysis report

Static analysis result for SHA-256 826bdbc7b019ff86…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 06:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a55ed0489c2ee5d8f30631824c020b1e SHA-1: 5e26ade2189c569b0e50d42e9c8b6b694d783681 SHA-256: 826bdbc7b019ff862faa8e89163fed61e44016c532b591327ea55a1005953cd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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=no+time+to+die+2020+full+movie+123movies PDF link annotation
    • https://mbbs.hr/files/22473691471.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/zodewedavavajisibu.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/mewilaruvagofotozepira.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/vufuxugusad.pdfIn PDF document text
    • https://blugarden.eu/file/pozelenokedolafofuzox.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/76534665157.pdfIn PDF document text
    • http://bankerz.in/qpic/files/nozemuzetadadugozez.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/gulotopezimunixuvodorop.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/lokanebofi.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109011803485632.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/84544101459.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161374de9641cd---gikemidogorox.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/pefuverafitev.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/bisubetiwefazez.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/47003778309.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/70130764797.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/fipovivelurudiwibeloxor.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/16918756531.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/zakoxelin.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/gedugenenorenafudidupome.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/2717770256.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/cd24gc55647qj8jvq37d3vkjk6/5238254717.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/85245506395.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/tezagipukijefubopalozated.pdfIn PDF document text
    • https://phunhai.net/upload/files/24917385285.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/66240436312.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210905112648.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_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 18004 bytes
SHA-256: 1d329bd2fd0705172c6aff0d685cb4954da0143e6ca3ac573d9b593c8fd1d7ff
font_01_sfnt_off000117bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD4 10760 bytes
SHA-256: b2b84f47cb6cf8349b63d9efb6bb192e4f7e5a366c956ede80b079d554f065d3