Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd88240382113963…

MALICIOUS

PDF

63.0 KB Created: 2021-09-25 04:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5768eaac6b8c037a7e5971c075925bcf SHA-1: 8c44c4dcb819897f2aeb3156f614c99d226a9ead SHA-256: bd88240382113963608b23722e92f6133339a1e47daf5e5373cb8c3fe9c19a72
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to exploit vulnerabilities or further obfuscate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

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 http://adacu.org/userfiles/file/20210904084537.pdf In PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/lavusetifafoperopujuludi.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/sukeduxumafovudafeziji.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/74134970373.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/83981011567.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/62505712324.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/19611630683.pdfIn PDF document text
    • http://status.cz/UserFiles/File/49846119093.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/84857430290.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/23b3bb472b57feebae6d47b37df1e1da/repipemijudazozu.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/22918913572.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/damuxexepopuvowukop.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/48400981563.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/kaxozomemesavuponuwizud.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/wozuxizixuvokodisugu.pdfIn PDF document text
    • https://ysh.my/userfiles/file/xeravu.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/xusenim.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/39815364051.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/e56c726a0e6055ce2f6b8d97f34ee6a3/75504697035.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/lejikix.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/56344781051.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/92206521347.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/70734316355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=can+i+see+who+viewed+my+instagram+postsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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