Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cd42dd09794666…

MALICIOUS

PDF

72.8 KB Created: 2021-02-23 13:50:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 6a072f3174a825a1e94d770897891062 SHA-1: c70e5585c1b6c697860c51811e249016f20f93e3 SHA-256: 50cd42dd09794666186c55111fc5f6579ec22e07e00e810467483ee4ec1486ef
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body, though heavily obfuscated, appears to be a lure related to a game guide.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://leonvi.ru/wix?keyword=rune+mysteries+quest+quick+guide PDF link annotation
    • http://xagidodovinudu.iblogger.org/86628352574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_600ca80d2cb82.pdfIn PDF document text
    • http://jotupati.22web.org/katalog_kabel_nyaf_jembo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495402/normal_602700da5624f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453540/normal_5fdad8f4d0888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5fe62be73bc00.pdfIn PDF document text
    • https://cdn.sqhk.co/ratosakip/liahbVv/growtopia_free_download_android.pdfIn PDF document text
    • http://pobijubak.iblogger.org/5232932350.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/jhgerih/wwe_2k20_universe_mode_online.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/36heXZj/robotic_process_automation_vs_chatbot.pdfIn PDF document text
    • http://dixojele.22web.org/lemawozefekesezad.pdfIn PDF document text
    • http://xosudodobuj.iblogger.org/27446089361.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nivobilov.epizy.com/17572919158.pdfIn PDF document text
    • http://jidabalelibixu.rf.gd/23455710416.pdfIn PDF document text
    • http://jibipadesubamom.epizy.com/simple_education_website_templates_free.pdfIn PDF document text
    • http://timevexow.epizy.com/nespresso_vertuoline_machine_not_pumping_water.pdfIn PDF document text
    • http://raburuterurova.rf.gd/thermador_steam_oven_user_manual.pdfIn PDF document text
    • http://gewumene.epizy.com/nufifowakoxerujoba.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 5316 bytes
SHA-256: 3962c8612b3fae8335f52b5a42dfd5c8834e8dc10b4baa8aa43cf187da33ae86
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 10212 bytes
SHA-256: 642574da08449e2f2e256d63bc409bfbf90b08ab2ea522b3448a6b477466c5d4

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