Malicious PDF — malware analysis report

Static analysis result for SHA-256 7090843e2a653819…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 21:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 523916efd47d1031e1e356df6b38cf1c SHA-1: 95ff391225e77211ec4f0263d0d903b613a2f03d SHA-256: 7090843e2a65381978c6cc24dcf4663c8f02689f7dc7462ba2eb9142224a7f5e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this PDF is part of a link farm designed to host or redirect to malicious content. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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 https://coretry.ru/uplcv?utm_term=deitel+c%2B%2B+pdf PDF link annotation
    • https://y3stwk65l-mn9.com/contents/files/71418640186.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/reralirazijilejux.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/4175148607.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/lojomuwitunesapuxisivim.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/degubalama.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/wixubiginozaguzomaborojo.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/tarez.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/puwafuwogezovumelukesavo.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/24520000462.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/xipawuk.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/4167270925.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/51863342312.pdfIn PDF document text
    • https://tepihtrava.rs/files/31091419864.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/kio2827lb3ish9rttut3h765s7/susatozegesexad.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/55077336763.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/26192645566.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/suzijidoginepotakimi.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/81811598183.pdfIn PDF document text
    • http://jainfarms.com/uploads/73307156164.pdfIn PDF document text
    • https://staging-info.sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/pomeparitowupejepirejevuj.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/40711586313.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/55928767089.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/figake.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/78280527551.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_off0000c7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DB 18612 bytes
SHA-256: 97e6e374003042b1b2736e709d7412387eab39883b4e5894e60f7369e078ce81
font_01_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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