Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5c2595cf66dac1…

MALICIOUS

PDF

76.2 KB Created: 2021-03-05 11:43:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: bbab1507d4549b3a86b2230c205e16ed SHA-1: 2048683db3cd79eafacf6792521eca7924390fc2 SHA-256: 5c5c2595cf66dac17ee8ad5dd17f4e185435475eadfaf49a135a1ff44d78606a
126 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, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution vector.

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://xajibur.ru/strik?utm_term=walter+benjamin+the+work+of+art+in+the+age+of+mechanical+reproduction+audio PDF link annotation
    • https://cdn.sqhk.co/worekoxe/crMyKXw/terakelobofe.pdfIn PDF document text
    • https://cdn.sqhk.co/sozimelizak/iigjiiV/heart_touching_quotes_about_love.pdfIn PDF document text
    • http://keto-menu.online/cloud_native_java_vs_golang8f9cy.pdfIn PDF document text
    • https://cdn.sqhk.co/vujuzira/bAjMica/world_war_2_history_channel_june_2020.pdfIn PDF document text
    • http://arenaprobet.com/kufetou7pyy.pdfIn PDF document text
    • https://cdn.sqhk.co/porekige/b4xjgjf/dragon_pass_app_cooperative_bank.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/77411512320cag5g.pdfIn PDF document text
    • http://wutoxurusot.iblogger.org/catholic_social_teaching_textbook.pdfIn PDF document text
    • http://nudistoff.club/booklet_template_illustratorh8p3a.pdfIn PDF document text
    • https://cdn.sqhk.co/xamubana/idniaPq/tivilowatapezu.pdfIn PDF document text
    • http://bestrongbyg.com/gikodis3wpf.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/ximupuv/74307690844.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/report_format_for_medical_equipment.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/vulimogux.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/whatsapp_apk_mirror_2._18._329.pdfIn PDF document text
    • http://nonogopikizezed.rf.gd/pasipekijejedagisapi.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/889421778.pdfIn PDF document text
    • http://gaxodisesi.rf.gd/canon_sure_shot_camera_manual.pdfIn PDF document text
    • http://febarodun.epizy.com/how_to_find_density_of_a_planet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 5776 bytes
SHA-256: 2f86e974a8143944fba1d16a3a984c19bbfe25f40cf71f3f74b5ad4ea4bccc26
font_01_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 10496 bytes
SHA-256: d9c84c99d111709d5d19af526f578f36928f441fb044c512e75dff22310f6732

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