Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22ba94a6948aa03…

MALICIOUS

PDF

75.3 KB Created: 2021-10-03 10:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c08e052ff7f18cb0fea1a71cd697a567 SHA-1: dcb53c71ce64149de6f95afb06b331fd420503d3 SHA-256: d22ba94a6948aa03f67bce2e65ea5cfc48085fc5941e8ce18a4d95b2e0991c61
134 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for PDF_JS indicating embedded JavaScript. This JavaScript likely redirects users to external URLs, as evidenced by the numerous unknown-reputation URLs extracted from the document. The PDF structure and embedded JavaScript point towards a phishing or malware delivery attempt, likely distributed via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://yanartekstil.com/firma/files/xowaninenuxojitakalujuve.pdf In PDF document text
    • http://savages.lu/imagesRTE/files/gelipebu.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/57080537118.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/48088368474.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/51004702851.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/38813988998.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/zozopulugeva.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/70013502256.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/53866130422.pdfIn PDF document text
    • http://klinok-saintp.ru/files/jekubofulakaviro.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/99468844090.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c107a9a5b4---vasafazek.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/96786710229.pdfIn PDF document text
    • http://reestr.fgosvo.ru/files/files/mepolig.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/jamikajemuturi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144bc1cb540a---fovurev.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/jujisadipigimabopufewos.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/22120621990.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/29161466368.pdfIn PDF document text
    • http://bushurov.ru/images/files/ledazev.pdfIn PDF document text
    • https://hgb.se/filer/file/rokaxizipelowa.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/kebixorifumotevugut.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/89591897200.pdfIn PDF document text
    • http://reestr.fgosvo.ru/files/files/38481299707.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/jixolatod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=aibe+previous+year+paperPDF 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_off0000bdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60E 10400 bytes
SHA-256: ab358004ad77e98ebab8181bcf6cfae646a93b129280e109c4b6ae6baceaad3b
font_02_sfnt_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 19260 bytes
SHA-256: 268b94da1566f6e07b589f01ea8298e4a0d9b8d8d6dfae9939836dfb1e3bea7d