Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d8c5e30d75485d…

MALICIOUS

PDF

73.3 KB Created: 2021-03-20 23:01:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bc1ed4e95059343e53c82882061701d SHA-1: 5a23d2538681f08f8f3e21684ea3cf50eb7f9c84 SHA-256: a9d8c5e30d75485d41b557b02e99003c9a4de3f6319e60ab8009d706122b8481
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous embedded URLs, with a primary suspicious URL being https://druttle.ru/strik?utm_term=percy+jackson+cast+2021, which is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to 'percy jackson cast 2021'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9169

Heuristics 4

  • 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.
  • 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://druttle.ru/strik?utm_term=percy+jackson+cast+2021
    • https://cdn-cms.f-static.net/uploads/4373788/normal_60367470ad75f.pdf
    • https://cdn.sqhk.co/sosexazefip/Bwjdgjp/28865319275.pdf
    • https://cdn-cms.f-static.net/uploads/4489713/normal_601136207757e.pdf
    • https://cdn.sqhk.co/pifajaloro/FPOggjF/98792712667.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_eda35bba59c44d1d978c0480255d2c94.pdf?index=true
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_0091943b5d1f45ea883d7a6fbe2e83c7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/804cff3c-31b3-4ddd-9ffa-4cbfd9623efe/93754432358.pdf
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_1d533ddb4ec94841ad1f82ba07e74b16.pdf?index=true
    • http://wagamaxoja.rf.gd/high_school_worksheet_answers_dimensional_analysis_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/23101ae8-900a-4526-9715-a95221285e02/best_answer_conflict_resolution.pdf
    • http://gozadowosib.rf.gd/10208008129.pdf
    • http://lobexot.epizy.com/how_to_connect_samsung_hw-k450_to_tv.pdf
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_c8af7fdb0687493a9876a82a82a3a5f3.pdf?index=true
    • http://wefazor.epizy.com/dufatosanuk.pdf
    • https://uploads.strikinglycdn.com/files/e5eb66cf-e274-47c3-9052-293dcb9b5ce4/dodge_ram_1500_rust_repair_panels.pdf
    • http://bimekikup.epizy.com/cash_for_apps_mod_apk_unlimited_points.pdf
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_148f77469ef541e5a3e1e7cbad50b271.pdf?index=true
    • http://scripts.sil.org/OFL
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed52.bin
6b2f5fe460db11c55bdecf7f802fbaf3c52dfddc8ac70295bd30c564bdf9fdf2
pdf-font-stream PDF embedded font (sfnt) at offset 0xED52 5068 bytes
font_01_sfnt_off0000fe66.bin
7928f6bfcacf4b8c2218b012f30d6a688f7d600c2bceec2598b03ee34226b8f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 6340 bytes