Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79e85475c540424…

MALICIOUS

PDF

44.2 KB Created: 2021-09-12 11:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36f279a141327262a3a7f8fd829b4619 SHA-1: f1e55cd4d36eece86704a5ae75261410b392d6c5 SHA-256: e79e85475c540424049723292774e6844222386ee7301e4516c62d0f94662fd1
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing trojan by ClamAV. It also functions as a link farm, with numerous distinct hosts and small PDF files, indicating a likely attempt to obscure the final malicious destination. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7355

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.
  • 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
  • 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://steammining.com/userfiles/file/11645545867.pdf In PDF document text
    • http://studiodebiaggi.eu/userfiles/files/kusazusinexaduror.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/tisameferi.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/fimixoxefaronuxiwenifoxu.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/jitaxugutivaji.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210909130138.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/91924690560.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/vulabukej.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/wekipaxevurapita.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/32937501580.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/85709836957.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/84199824675.pdfIn PDF document text
    • http://bushurov.ru/images/files/30090274986.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/makuzejevisilozijonivofu.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/98033145295.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/27195868975.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/23588186885.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/zevukexibagekivir.pdfIn PDF document text
    • http://iltorg.ru/upload/file/88175902767.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a9mm12u955pvis69imu3kjetq1/72667763748.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/sujolede.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/zokoror.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/23269676416.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/soketejamorod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+use+insta+saverPDF link annotation

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