Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0a05a2783f1dfa…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 23:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b4179b55040f47d69a0cfb1f90a3e69 SHA-1: a297574b7df6619128d54ea76968165171c548f0 SHA-256: ff0a05a2783f1dfa608de9f29f681fd6156d0027827087197a512f9ebd062f01
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://fabrikando.com/cmsimple/images/file/24790548055.pdf In PDF document text
    • https://muzeumkonstancina.pl/attachments/file/34111987875.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/33671302283.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/9614278548.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/zebagoge.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/novuxiwififudomuzilevale.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/valit.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/47751143717.pdfIn PDF document text
    • https://satesayap.com/contents/files/mizezarenaveb.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/82056005022.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/74360479501.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/rusesezugefaxajirivijinov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365816a1c73---nasununinidutom.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/64808438575.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/kukogapoxubokege.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/luguzotivivivarisig.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210910_234606.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614048fbc6a0b---gunixopad.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/gojodalumokusebovomemeno.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/papexigurodiputanubuviri.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/rujesowasolukex.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/vedesuginulolemababitir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+tabs+examplePDF link annotation
    • 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_off0000cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 18648 bytes
SHA-256: c63487df2f235d28344afdc81e5ef642f8769ae1324ca6d88993d5adce3ccad3
font_01_sfnt_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 10776 bytes
SHA-256: feab13a439915eca8d375e58e0e44e4eb81b2abba4466d3130b4370d2b857d92
font_02_sfnt_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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