Malicious PDF — malware analysis report

Static analysis result for SHA-256 307788f8043bcfda…

MALICIOUS

PDF

71.8 KB Created: 2021-03-19 07:23:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 52aeddc805b572255db40bc5f640b7ba SHA-1: 1078a74ab9bb6c3d494c59688a3d5aaf16f5f7f2 SHA-256: 307788f8043bcfda52c1910ad42310628a7b5cc046f81ee33424dbe8dea09765
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://golowaki.ru/strik?utm_term=what+is+difference+between+freedom+and+liberty PDF link annotation
    • https://dapazigozasonim.weebly.com/uploads/1/3/4/4/134466252/masiraj_kabol.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/9741545.pdfIn PDF document text
    • http://healsmall.space/fetebubu64qom.pdfIn PDF document text
    • http://devlp.design/live_wallpaper_galaxy_s9gcap2.pdfIn PDF document text
    • http://zespodsvetkoy.site/twilight_portrait_full_movie_watch_online_freectusr.pdfIn PDF document text
    • http://gazedalepi.sportsontheweb.net/astm_a193_gr_b8m.pdfIn PDF document text
    • http://aires.fun/diesel_mens_belt_size_guideann2d.pdfIn PDF document text
    • https://relakurofur.weebly.com/uploads/1/3/4/8/134872141/168206.pdfIn PDF document text
    • https://kowupozot.weebly.com/uploads/1/3/4/8/134887449/11f6ab7953.pdfIn PDF document text
    • https://gevoxegugajaber.weebly.com/uploads/1/3/4/6/134668378/kaligature.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409420/normal_6037a618036fe.pdfIn PDF document text
    • http://uniques.space/sokanejapufamuvafpflvk.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/vox_ac15_used_price.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422897/normal_6050c99b4d0fc.pdfIn PDF document text
    • https://zaketedojerobi.weebly.com/uploads/1/3/6/0/136023974/47450.pdfIn PDF document text
    • https://doxifivot.weebly.com/uploads/1/3/4/2/134235468/nazapajixunofosobe.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/deeb8a83-38a6-449b-bc6b-2ee38fce6957/xilovizujajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c78be0-3628-4d5a-8dbe-c97a7cc96ed4/cub_scout_uniform_prices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab08c9c-f328-4080-ad8b-4cadb288d7c5/student_information_system_registration_bu_bhopal.pdfIn PDF document text
    • http://zesafemumibow.myartsonline.com/pobubexizipiwexogufe.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_off0000d932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 5608 bytes
SHA-256: 881cd378ece3623e6cfa910cd47018e9e20cc42e9d92c164744b533545bffba3
font_01_sfnt_off0000ec38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 11024 bytes
SHA-256: 9076b93de9545fd8f2c903ac7119caab1c2e0db86f45e1ddebd969abcc922c37

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