Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83a50fac522aa9b…

MALICIOUS

PDF

43.1 KB Created: 2021-09-13 11:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99b74ce2031bc05526dd2b976dd729c8 SHA-1: a2aa986b973829e8b323db22b4c49043151c4644 SHA-256: f83a50fac522aa9b65d103eef671c7f3c7232a7fbc185862d1056e1d2beb1b7e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to external sites, some of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating many links on low-reputation hosting, often used to distribute malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8035

Heuristics 4

  • 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
  • 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://chcial.ru/uplcv?utm_term=different+human+species+timeline PDF link annotation
    • http://danchrisjewelry.com/userfiles/file/73676279995.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/28317206208.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/wonukilupofatewegibetisu.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/22813663656.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/belewowilefomilefopesurek.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/jujotutuxabuval.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/punemog.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/pinexunokiwaviwawizaveke.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/kejedapiki.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/p8s0u8atteoumdkptc95emkhms/datemunogufel.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/jagasiguvu.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161371dffc797f---musizuranipipigevudur.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nigexesakozaxewotefolujo.pdfIn PDF document text
    • http://cityfate.com/files/files/82351062155.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/105059548.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/35697920358.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/tiwamorar.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/51949375465.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/fekubukamavos.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/18565221319.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/99545030170.pdfIn PDF document text

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