Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f4363ea6e0ccf7…

MALICIOUS

PDF

77.7 KB Created: 2021-06-09 16:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 224bcdab1d26a094d493b4cc3029e03e SHA-1: 11637bca1ace8082f7e2ea22e0c3207e30a7539d SHA-256: 41f4363ea6e0ccf783f6f7af62748ad4e4fa4ee62b32b49a462b98a5d0847a4b
186 Risk Score

Malware Insights

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

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 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://ketchas.ru/pbw?utm_term=la+campanella+guitar+sheet+music PDF link annotation
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/fazojitowefil.pdfIn PDF document text
    • https://sogegagep.weebly.com/uploads/1/3/4/6/134687839/firulupu-josubik.pdfIn PDF document text
    • https://govenovu.weebly.com/uploads/1/3/4/7/134701044/xijepow_wodizizi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rorazokazog.pbworks.com/w/file/fetch/144837687/vuxesafevibekaj.pdfIn PDF document text
    • http://mugobug.pbworks.com/w/file/fetch/144792711/lubanokojumizigugukixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc64cba-69c9-4f7e-b372-2089605fa08d/90365182637.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/tecnologia_3_eso_ejercicios_resueltos_anaya.pdfIn PDF document text
    • http://pojaweku.pbworks.com/f/differentiate_formative_evaluation_and_summative_evaluation_with_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08bd9298-1265-4be5-a9d6-27884d338c56/is_the_nc_concealed_carry_test_hard.pdfIn PDF document text
    • http://magobok.pbworks.com/w/file/fetch/144555711/what_foods_are_naturally_high_in_gluten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c3acdf-1e7a-4a3e-932e-591bcd7e5a38/xivazexakasinuben.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144668928/bagoxefobesa.pdfIn PDF document text
    • http://niluputevi.pbworks.com/f/design_for_manufacturability_handbook_bralla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90fe4d31-8ddd-4009-8dd8-9277b860fb60/32156119539.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/w/file/fetch/144489141/teri_akhiyon_ka_yo_kajal_mp3_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/064eae02-7a4e-43de-be56-78561830df44/3946287217.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/download_activation_key_crash_team_racing_nitro_fueled_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40985bf9-585f-4e5b-9c45-41a4c9c31552/42097938680.pdfIn PDF document text
    • http://zelovoguvunu.pbworks.com/f/arc_length_area_of_sector_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c576c90-9aa1-44b8-b460-c002ae8a80a0/streams_in_the_desert_charles_cowman.pdfIn PDF document text
    • http://jutopar.pbworks.com/w/file/fetch/144730062/paluze.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/w/file/fetch/144777072/tukidapa.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_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 5288 bytes
SHA-256: 53667adaf5fa84c8246146a8edd25ac04b98e453669d8326a9cd363fdbc1ea62
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 10360 bytes
SHA-256: c90afe31c9c971adc455e54af24171c2726e994ebeefe6448990e3f2da275bd2