Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde33f407240b497…

MALICIOUS

PDF

71.8 KB Created: 2021-10-02 15:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0bc740df85cc4077a3170d87e871e4ac SHA-1: 74b624cb85117264251f8f06df19dcc90f3a605c SHA-256: bde33f407240b497b26abb76174ee55fac0880bbd245a7c0264db3c056ef8081
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs suggests the PDF is designed to redirect users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true malicious destination by using a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+tie+an+elastic+bracelet+knot PDF link annotation
    • https://perkunasstudio.com/uploads/files/202109221047178925.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/lumefofexeno.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/56452265433.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/67422841249.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/51330234776.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109270446429739.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/62115928218.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0a207d01a---mixutotogo.pdfIn PDF document text
    • http://stroi-sistema.ru/img/bexumenivinubu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144bdc9044f7---68104132674.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/fagub.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1632799697.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/webidewudowajogidavodurud.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/kazexuweruwo.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/pukakiwekaweb.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109062132476027.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/sumeditojujiruxojatudize.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/mijadudupebalilixetemixe.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/pokiwiz.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/piwirodaberom.pdfIn PDF document text
    • http://fullmagicweekend.com/ckfinder/userfiles/files/12124590634.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/20853075423.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/83307916116.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/levepotevimodugusaf.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/wawodo.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_off0000b72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF44 10532 bytes
SHA-256: ccea8796fba849b40b3130d8616b336a7901a85c5fa3dadc80faa8a502eeee81
font_02_sfnt_off0000e771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 16300 bytes
SHA-256: 74f707e06695e97771ac0ae5c5a0ffb9c86a7c912e499995886a5a8be8340a41