Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da3806d8e540059…

MALICIOUS

PDF

71.1 KB Created: 2021-09-12 21:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23c1adac24b84cb20727c3ff70569635 SHA-1: 2d1beff277e2dbf8d0df0c260c52e83105d349d1 SHA-256: 5da3806d8e5400595346624953b165e52ff35908dd9d84285b35063b33cb2597
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=resident+evil+4+psp+iso+download+2019+ppsspp+android+emulator PDF link annotation
    • http://tokyoto.pl/UserFiles/file/vozubodupasi.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b188d36dadf5b1031709d3729c274cfc/wuladajo.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/59706136400.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091108031322.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/gejagekaf.pdfIn PDF document text
    • http://metall-press.ru/files/rununuroxadejiravefud.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/vukaluradifuzo.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/48086529464.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/dejexa.pdfIn PDF document text
    • http://freewest.at/dixuzijubojukinuton.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/xuwexilevijoluteve.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/79352625382.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16130745a2fefe---wubiwoku.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/21357005045.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/xarojimugegegejejilix.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210910102658.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/kumid.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/ratute.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/34506267193.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/78498062890.pdfIn PDF document text
    • http://katachizu.com/img/news/files/16241599865.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/63168997255.pdfIn PDF document text
    • http://ciiinnovationsummit.com/ci/userfiles/files/duwoz.pdfIn PDF document text
    • http://autovoda.ru/upload/files/65750458321.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_off0000af24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF24 17520 bytes
SHA-256: e14d1635f73183d11f8c3eb8c419905c6ef51f103c00e5431cd69012266b644b
font_01_sfnt_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 11388 bytes
SHA-256: 9ab986509be4297465a5ee9894684daa14cdf71d0db4ede4b9783add069346a5

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