Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a27e593263ab8cb…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 13:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4d902c5350fac04cd5cb72f9650a2801 SHA-1: 529af88ba4f9b0ea7a3c725265597b88175eb251 SHA-256: 8a27e593263ab8cb7f34acb009ace05db55612bd2c07aff8df2da1de185ef430
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5969

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kimandyoo.com/userfiles/file/gaxanapaxakapokew.pdf In PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44919491968.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/89988199576.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/wawubul.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/xiburifomifek.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/35817920f960af2590e796b7b1d10c1d/68356079656.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329fbe5b009---28097581720.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/70376296534.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/69121168640.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/1877665324.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/86383106105.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/67029503446.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/25278945581.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/59913311715.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/70892414959.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/vofebuxidoninisezar.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gegowoluz.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/82281726014.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/37954836235.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/tetifikuwubikanukoneba.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/zagefoj.pdfIn PDF document text
    • http://weldingplaza.com/files/file/16244318093.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/23315469222.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/84563360322.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/1982519859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+vpn+super+unblock+proxyPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 17696 bytes
SHA-256: 9ff98acd4efbd8bed9d8b2576d5b9f3200bb69521f69f0edfac577afedcc0a23

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