Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81fe95965495773…

MALICIOUS

PDF

64.9 KB Created: 2021-02-15 06:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 725660109ece98cbbb0c8879960c8498 SHA-1: 9d3c038f3447e0fead39aa0255206cbac5134fbd SHA-256: c81fe95965495773aaeaf92e7ba2f89b2625c74ee4ce698f73a3dcc4a550be0f
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=back+titration+calculations+worksheet+with+answers In PDF document text
    • https://cdn.sqhk.co/posaleren/jcx0vgh/telehealth_by_simplepractice_for_clients.pdfIn PDF document text
    • http://kerubidezarido.iblogger.org/android_studio_github_pull.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/M1gdiiw/tugidojafajovorirazojisug.pdfIn PDF document text
    • http://fesaniru.iblogger.org/tracking_expenses_spreadsheet_template.pdfIn PDF document text
    • https://teraxumafelenug.weebly.com/uploads/1/3/4/7/134747654/2260867.pdfIn PDF document text
    • https://cdn.sqhk.co/susojitigi/dTTTigP/zujizeferomisedudusigovup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5fd0862489b6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368486/normal_5fcedc56bfdac.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/kUaiiHs/mukufivodu.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/00d39d46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407986/normal_5ffca35714ec3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402960/normal_5fdef060d9921.pdfIn PDF document text
    • https://midupupivubol.weebly.com/uploads/1/3/5/3/135343472/54735963ca9fa8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vosolapigufax.epizy.com/eenadu_epaper_total.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/adam_ruins_everything_full_episodes.pdfIn PDF document text
    • http://gosigolixadi.rf.gd/chest_thromboprophylaxis_guidelines_2012.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/82040896786.pdfIn PDF document text
    • http://fusizizugunu.epizy.com/manosidegikizekut.pdfIn PDF document text
    • http://xijovapafibowuw.rf.gd/ni_crio_9063_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/jefewonavanikarexum.pdfIn PDF document text
    • http://wupaxozejite.rf.gd/freelance_work_agreement_template.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_off0000c357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC357 5092 bytes
SHA-256: bf451a8c12f55eadc89865948e1c62e4221726eae5ede2a121e197abdc30c140
font_01_sfnt_off0000d4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B4 9852 bytes
SHA-256: 9a9bcfcc4839bc30a49d9720ad2729de0f54760c50bc854e0dc935f1fc3e24b5

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