Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fd95d64b16981e…

MALICIOUS

PDF

69.8 KB Created: 2021-10-02 12:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8950f454a96e8c22d2992a72906adba5 SHA-1: 4037f3082b46d7d9e550825d84bb0ffd7ef15522 SHA-256: 84fd95d64b16981e2f507d186603a8a29b486123856b0ad3078e45c3ebef5930
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 hosted on disposable domains, 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 URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=what+is+the+best+time+to+plant+pansies PDF link annotation
    • http://engelholm.boj.se/uploads/userfiles/files/zijikokunarizidifo.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/wageje.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/lifozule.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/61617938902.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/89731537716.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/1538676956.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-25/20210925095449223808.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/gewum.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109231233541634.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/be24b1eaff9e2fa9285ba773dd4df46b/73545460069.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/levivetirapogaguw.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/55570699597.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/punane.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/fajilemet.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/70220921274.pdfIn PDF document text
    • https://onecre.com/images/content/files/40298224868.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c68c199176---patejalezaseworifenol.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/tidizobivitowinepezawalod.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/53965302530.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/davuxewebavopuji.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/21238669770.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23796978193.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210907144744.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/63411961217.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_off0000b360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB360 15288 bytes
SHA-256: e282d7aaeb86b8b34617f550dbbc9cb75042adc26b9edd7d3bfc48f8b4c7aa98
font_01_sfnt_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 10548 bytes
SHA-256: 0d64e3825ba44f25ed035d39f772ca3e251c101235ea14a04d82e9eff2d77c61
font_02_sfnt_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1