Malicious PDF — malware analysis report

Static analysis result for SHA-256 53eb05cf520f822a…

MALICIOUS

PDF

88.3 KB Created: 2021-03-20 17:46:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ad80f03ac7fc3c0e74043e9ea0b41c7a SHA-1: fd91f3ed7a41b70fae3349478b9eea6edb5514e8 SHA-256: 53eb05cf520f822a17018f4bacd9f7a0453bc98fe6f1e4355a41e148218bc3e2
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of multiple external URIs, many hosted on disposable domains, suggests a link farm or phishing infrastructure. The heuristic 'SE_URGENCY_LURE' indicates the document likely uses deceptive language to prompt user interaction, such as clicking on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://kuzutuzo.ru/award?keyword=treatment+of+hepatitis+b+pdf PDF link annotation
    • http://zawugexoj.22web.org/agile_gantt_chart_excel_template.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/tozuneluduludevibuwajaauubj.pdfIn PDF document text
    • http://zewamiluwevegif.22web.org/gomoragiwepadewomesemesu.pdfIn PDF document text
    • http://jonezuno.22web.org/amu_11th_application_form_2019_last_date.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/kenneth_cole_reaction_analog_digital_watch_manual.pdfIn PDF document text
    • http://dapovevi.mywebcommunity.org/aircraft_maintenance_engineer_course_in_india.pdfIn PDF document text
    • http://zuxuvikewi.sportsontheweb.net/kumuzagarunuxopunasojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409827/normal_600fe735aa05c.pdfIn PDF document text
    • http://trylait.pro/86614979787ldvsf.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/osteoporosis_fisiopatologia_2020.pdfIn PDF document text
    • http://clientesdkb.com/past_tense_worksheet_ks2nz446.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450428/normal_5ff8ddc7a5892.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_601a99e40c939.pdfIn PDF document text
    • http://jepaxikunaku.iblogger.org/the_cellist_of_sarajevo_plot_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481522/normal_5fe17fa28b7f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/nipifavuwuletarasujafa.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/benedictine_breviary.pdfIn PDF document text
    • http://fijexagag.epizy.com/how_to_draw_101_cartoon_characters.pdfIn PDF document text
    • http://nununad.myartsonline.com/marlin_336_dark_specs.pdfIn PDF document text
    • http://wuparol.epizy.com/gcra_bursary_application_form_2019.pdfIn PDF document text
    • http://panurimo.epizy.com/latitude_7490_spec_sheet.pdfIn PDF document text
    • http://lokimutopilar.epizy.com/97570321437.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_off00011c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C91 5336 bytes
SHA-256: 306d60053836887cf81641bdc851cbe065d2007a434ac226fb79e537dcf39d0d
font_01_sfnt_off00012e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E81 11204 bytes
SHA-256: 0ebdb8e5af12515fb8c214a69ad96a67605059f8b99843ade1bb6ab0f3540d21

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