Malicious PDF — malware analysis report

Static analysis result for SHA-256 90be501b88b68e5a…

MALICIOUS

PDF

77.9 KB Created: 2021-04-27 01:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e96e9f12ab420daa693212ba9d225cd9 SHA-1: c5dfc12c19c9de664548f903ac490fd10a9eecc2 SHA-256: 90be501b88b68e5a321bc6b60a68a668086999b04bf8fd2619db3b3af52210fb
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a prominent one being 'https://leonvi.ru/strik?utm_term=polaris+office+app+for+pc', suggesting a lure related to software. The PDF's structure and the presence of multiple disposable domain links indicate a phishing or malware distribution attempt.

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://leonvi.ru/strik?utm_term=polaris+office+app+for+pc PDF link annotation
    • http://jerunuju.mypressonline.com/english_a_language_and_literature_course_companion.pdfIn PDF document text
    • http://vijoviresole.mywebcommunity.org/gobakasu.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/fefip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_6013052115a32.pdfIn PDF document text
    • http://vijevejumozugim.sportsontheweb.net/cara_main_game_atlantic_fleet_lite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407327/normal_5ff01833dd70c.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/penatalaksanaan_penyakit_jantung_koroner.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/future_annuity_table.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruzofugeru.myartsonline.com/tadapifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55d8ddb8-e998-41f2-8102-c567ac6a7ebe/how_to_perform_cpr_red_cross.pdfIn PDF document text
    • http://jusudab.epizy.com/christmas_card_templates_for_photographers.pdfIn PDF document text
    • http://fupuvomevo.rf.gd/wosunukupelavivawojo.pdfIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_de0bb08098ea4eb9b3ffab8fae875179.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f80c757-5f6a-405c-8f9c-168c97a2139a/sufurijifowasolutaleneta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39ef6ee-9408-4122-ac93-1705462dce18/que_es_una_propuesta_de_valor_en_una_idea_de_negocio.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/nelejomumaroxilo.pdfIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_8c9547ace5ee427c83ba816309be80b3.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_1810796a6bdb4308b7c97b731275095c.pdf?index=trueIn PDF document text
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_de10dbb0aa19404e9d29894092a33eb5.pdf?index=trueIn PDF document text
    • http://jiroribi.epizy.com/telemupixal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6571a3da-a09a-4266-bb0f-a138dc3696eb/08_dodge_avenger_problems.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_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 5008 bytes
SHA-256: 96899b32b1b9f9acbfe80169cb323d9a9c20919a1bae851778eb670e2e84aecc
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 12988 bytes
SHA-256: ced86d36e1fa755e3a7b1397dcb5adc09d4336348c6a5b7d51d939e43deb04c3

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