Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a8730fd9327e11…

MALICIOUS

PDF

88.9 KB Created: 2021-03-19 09:21:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c497c6cb0271a98e32ffe4e58b311cbe SHA-1: 5955206fa7b00d3af3a16269661e80b7de83ddae SHA-256: 92a8730fd9327e11e3f114e479912064992740b77b9204ece1b98f635b6aca20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/award?keyword=exemple+de+cahier+de+charge+site+web+pdf PDF link annotation
    • http://kovativegapok.getenjoyment.net/kalifosujorolufuk.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/aCgeDhb/8279756596.pdfIn PDF document text
    • https://cdn.sqhk.co/besewixogiv/V4Pggic/angular_viewchild_formgroup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454665/normal_6025c27b93fed.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/how_do_you_bake_in_an_electric_skillet.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/readings_for_sociology_8th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_6033af98a7a80.pdfIn PDF document text
    • http://yewes.space/wojapu5tjof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489257/normal_6003c0f875bb4.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/grade_7_maths_exam_papers_south_africa.pdfIn PDF document text
    • http://iblack.space/798916287073bszs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/995ca72d-60d7-4392-83c8-ceb3fba23e17/the_ancient_secret_of_the_flower_of_life_volume_3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ce2627c-c67c-47a9-8702-52efdbd76fd3/xinafesadixazovapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b4aa60-8b0e-44ce-9b69-97f1c8a027ab/what_kind_of_oil_goes_in_a_power_washer_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4288b984-3144-4c74-b3d2-3f2870697012/xeruxinevisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd895068-13c0-4b95-99ef-8fbba87c2aab/football_manager_2015_data_editor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2430ec7-93af-470e-b5cc-9519b873696b/ejemplo_estructura_organizacional_plan_de_negocios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e9031e0-72f3-4cc6-a648-45ea23d20c17/dragon_age_origins_blood_magic_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ddc8e34-aa65-4ab6-bcb8-9aba51f08e9f/bipokumepomejovonute.pdfIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/bohemian_rhapsody_piano_sheet_numbers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 5828 bytes
SHA-256: 40066ad23cdcf8fda517a03a77068bae43b19056df469a7381821bdee476873c
font_01_sfnt_off00011a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5B 12504 bytes
SHA-256: a0ee9b88fe754155640707b5067317f18f5e6cc6aaa3722f5de02027f4a924eb
font_02_sfnt_off000141d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D4 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2