Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a8fe4347175243…

MALICIOUS

PDF

76.3 KB Created: 2021-04-04 01:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f179a4327f9681e4e70b8eede02b729f SHA-1: b0024cc4bcea8c2447c53b93fb42dff6857b6158 SHA-256: 09a8fe4347175243c7e69d9801b2af6c56018844af0743b1c3be45fced894a6b
126 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, including one pointing to maypoin.ru, suggesting it's used to redirect users to potentially malicious sites. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports its role as a link farm for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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://maypoin.ru/123?utm_term=twitter+video+ios+shortcut PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5fece614ede4b.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/iiiEfha/ibis_paint_x_free_download_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/dawiredi/CqggvvW/tenimozagew.pdfIn PDF document text
    • http://demijuv.iblogger.org/grade_3_fractions_worksheets_south_africa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368504/normal_5fdf96ccce1e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_605ca6f7e041f.pdfIn PDF document text
    • https://cdn.sqhk.co/mitebosareki/fhfU4ge/fivoz.pdfIn PDF document text
    • http://vijufik.iblogger.org/assamese_full_movies_mission_china.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_6010823e5ed50.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pukewideje.epizy.com/australia_passport_renewal_form.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_d986610d07164d1ea9a443e1588e1457.pdf?index=trueIn PDF document text
    • http://pimeduzuruwoboj.rf.gd/sebixesudujiwutufov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca9f116e-2ada-4ec9-bf29-830abaac6c5b/what_are_the_4_stages_of_development_in_the_uae.pdfIn PDF document text
    • http://gobipumedijesi.epizy.com/corporate_governance_report_september_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60cc9e82-1f8a-4c51-a9b7-2c58b5c08185/jerry_kuhnhausen_1911_shop_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0f9cce5-42f3-4bcd-9605-64a9d1349ef0/ubuntu_oracle_java_jdk_8_installer_ppa_discontinued.pdfIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_d0d9f2f0605c4549a92537a125ee99a8.pdf?index=trueIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_1df13b50b8ce4d3a97b0237dadd83705.pdf?index=trueIn PDF document text
    • http://wabupotobexuxu.epizy.com/safety_first_grow_and_go_manual.pdfIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_737e182774044ff0adfc337d4fc7584f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0bdf16-d561-4cbf-b980-c509c18108f0/sivag.pdfIn PDF document text
    • http://segenuf.rf.gd/juborekugelidu.pdfIn PDF document text
    • https://034b020c-baab-45d1-b3ff-c950d21f9178.filesusr.com/ugd/3c93bc_f024c80a1f1e4f49b564021c00d2e07b.pdf?index=trueIn 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_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 4884 bytes
SHA-256: 54d4300e4965fd3a00578c0c5c18a1ad378cda02e73335ade2e9954f5fc42668
font_01_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 11040 bytes
SHA-256: 00cfd8dc073fcca8d1a95c2edeb63812bfe186b7aea84696626a536d0ec65531