Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57a01125c51f668…

MALICIOUS

PDF

74.5 KB Created: 2021-04-13 08:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 18885e9801c1cae2bd8289743121ff7a SHA-1: 7835f925a662625fe9f2e58854202b6ddf81cc58 SHA-256: e57a01125c51f6682911f611e4d3d4bff18e2b081f834cbec89f94fd578a0baa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a sophisticated effort to hide malicious links within a large number of seemingly benign ones.

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://druttle.ru/strik?utm_term=you+are+the+message+by+roger+ailes+pdf PDF link annotation
    • http://retesopi.iblogger.org/american_pie_1-_8.pdfIn PDF document text
    • http://copyrightnotices-form.com/62943613643nsrly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450351/normal_601bb9aeead60.pdfIn PDF document text
    • http://oyuncuxx.com/information_technology_cv_samplecr1kd.pdfIn PDF document text
    • http://bozazareter.iblogger.org/supabubuvijegudopun.pdfIn PDF document text
    • http://fekevopimibun.sportsontheweb.net/32761122143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481839/normal_600de9d3d81f9.pdfIn PDF document text
    • http://tazikuruwuwozu.22web.org/grover_washington_jr_winelight_sheet_music.pdfIn PDF document text
    • http://luwimifamofuper.iblogger.org/security_analysis_2nd_edition.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/macbeth_and_the_apparitions_act_4_scene_1_worksheet_answers.pdfIn PDF document text
    • http://sutiboju.sportsontheweb.net/67357714934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393022/normal_5fcc53f21a55b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427821/normal_5fcbde47286f2.pdfIn PDF document text
    • http://zoferili.22web.org/presentation_about_myself_for_job.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nawugem.epizy.com/steam_api_init.pdfIn PDF document text
    • http://fifumuwun.epizy.com/abbreviations_for_gk_quiz.pdfIn PDF document text
    • http://surufutikexa.epizy.com/anamnesis_jurnal.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/john_deere_lawn_mower_repair_shop_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/the_bell_jar_audiobook_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/police_investigation_report_sample_format.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_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 5660 bytes
SHA-256: dfcb91059026cc2bf6e47010b621e32b4326f5f02be133c61cc484e389bcf096
font_01_sfnt_off0000fa86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA86 10156 bytes
SHA-256: b5851df87d3f06862cd20d6a7f45ffb0a27a2a326fb5437cb93d8b677587e49f

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