Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d9905414f99970…

MALICIOUS

PDF

78.4 KB Created: 2021-09-11 11:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c13e19a79e64548e9d94dcc659acfc12 SHA-1: f4cb7bbf295bc973e603679dbc6aa984b7504293 SHA-256: f5d9905414f99970b9fe9cf8cd1916cb7073c4741f9ecf7fa6437b736dc3db22
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. The embedded URLs suggest the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=solution+to+app+not+installed PDF link annotation
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/fc9cdaef88158de6744eed4b513f428f/pewiza.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/1061575474.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-2/20210902155542613942.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/61966015898.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/1347995871.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/kavitiseruxig.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/motazekiki.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/wuxarafoliganiraluzote.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/50343848931.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/43908903688.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/muxunijaw.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/zutujuxitegigoja.pdfIn PDF document text
    • https://suncables.co/images/file/77779049663.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b80ffa9c3a---fidorakem.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/80764868446.pdfIn PDF document text
    • https://yodobashi-church.com/62464760051.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/gewojawejitazefuwojuvogak.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210908181707.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/28345574497.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/todalarojusegagujuxupa.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/21599248668.pdfIn PDF document text
    • https://ms02bet.net/contents/files/72944573877.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/1539005767.pdfIn PDF document text
    • https://krusomying.com/data/file/desilewaganitijuk.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/21094013427.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/vukumuroti.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_off0000d001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD001 17144 bytes
SHA-256: 1032da0e382956d9154397061f939c794847da8984597787fc50c8f23c75c412
font_01_sfnt_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 10460 bytes
SHA-256: fd8f61721e83022a03493ae3402fd449447637ad39d3e1447b8677036ad4b8b9
font_02_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1