Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95ae75ca587b0f3…

MALICIOUS

PDF

98.5 KB Created: 2021-10-04 22:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d8f04a9db722f9fb09dfb7e53192d242 SHA-1: 9bfbfc420bcb9d51e35dba50b29d87bf33d9486e SHA-256: b95ae75ca587b0f352affc83d206a4668616165e5bc479d8005408484ecb58b1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, suggesting a link farm used for phishing or malware distribution. The PDF's structure and the presence of JavaScript indicate an attempt to exploit vulnerabilities or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2789

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://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614b98c4cfe50---72262571788.pdf In PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/gudalulizifonefamimab.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/vozajigesozoxukowur.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/wipolaruwusebulinivobew.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/46693550202.pdfIn PDF document text
    • http://fruitsad.pl/images/file/birusafokifekeves.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/jasowufikubivezaduv.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/tekesanexisutewodidepipa.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/14965700377.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/mewisepexozisoki.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/62965720330.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/juvexi.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/jasukanodexako.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a2f8f012a---woriwipovanuwuvi.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/31240830545.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/54343875085.pdfIn PDF document text
    • https://planbmedia.hu/files/nijewepolaxujanal.pdfIn PDF document text
    • http://vce34.ru/attachments/file/19666093564.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/70577453245.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/1090865178.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/2067124541.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/94926022382.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/gofexukupuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=family+consent+letter+for+marriagePDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/xenosuxi.pdfIn PDF document text
    • 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_off000134af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC6 10768 bytes
SHA-256: 32690dbcbc060eef7347ff01055f0b3d80f949b377e94f8fd2e5e402107e4e4f

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