Malicious PDF — malware analysis report

Static analysis result for SHA-256 16416be0f7bbb271…

MALICIOUS

PDF

87.3 KB Created: 2021-05-08 06:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6f6460a5d3568291d9cdee6290db785d SHA-1: 2ebb2d546438a010053972dba88a87700f83ba94 SHA-256: 16416be0f7bbb2711dced1c532202a713554733d1e7ea5a9fa7c0b397d6919fb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high density of links on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://soxebez.ru/strik?utm_term=will+aot+manga+end PDF link annotation
    • https://cdn.sqhk.co/gosukutusu/enic0dw/ambi_turner_pro_apk.pdfIn PDF document text
    • http://greatholl.com/clear_skin_forever_book_freey74ct.pdfIn PDF document text
    • http://nazhivy.net/nextbook_10.1_2-in-1_detachable_tablet_pcql10j.pdfIn PDF document text
    • http://erogan-oficial.site/biogeochemical_cycles_webquest_1_answer_keyrzt2b.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/jcojfrY/wupozolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5fde1a44c7344.pdfIn PDF document text
    • https://cdn.sqhk.co/pigujoxexate/ojfhcjg/castle_of_illusion_ps4_store.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489440/normal_5fca4ea4c7c91.pdfIn PDF document text
    • http://boviriso.22web.org/interview_guide_in_research.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_6024a1ea7f1bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456687/normal_5ffbf0892a112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446635/normal_60532fb448a5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rokazit.epizy.com/bajar_musica_cristiana_gratis_para_celular_android.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_d8f2b00d8e124b5fb32ca1dbf0254fc0.pdf?index=trueIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_1ab486bf403f4afa90096228e29b69a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a5d4ff-7cc9-436c-9b19-ddde56838170/emerson_thermostat_1f80.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f633f5eb-5600-4292-9613-cd7cd702f684/sejusiliweb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e49415d9-989c-4762-b7f0-fe607d7e21e3/black_ice_r6_shield.pdfIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_ba00514d480f48689693ddab9ea30799.pdf?index=trueIn PDF document text
    • http://fopugaxug.rf.gd/69917260847.pdfIn PDF document text
    • http://zizinamejukurep.rf.gd/lymph_nodes_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d41ff16-c651-419d-abb5-da22f7a9c623/99603699812.pdfIn PDF document text
    • http://kubumoran.rf.gd/tarevitikukefinuzutumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b238df-0100-4b37-a5f7-e0e3d0e3f8d9/xipuzoru.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 4120 bytes
SHA-256: 03eeafd9f3f3cb3c1d547ed97ffb4a36788d803c3cee82d2c5954144e6774ea9
font_01_sfnt_off0000fe6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 4884 bytes
SHA-256: 3fe78122addd844cdae5ff5ecf580c4530ac28fdbf5dc5cc1f7e51a30e4eb8bb
font_02_sfnt_off00010f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F05 13432 bytes
SHA-256: f269fd4d709c4edf1717fc7432157ce6d4d4b25c1ff39622eda612cff1aebd90
font_03_sfnt_off00013a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A98 16060 bytes
SHA-256: 5bd88bd5c44eb894b151ed33ba27cda91e6b534aa93a3b288c9f525c64baf622

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