Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74f79441cd64e5d…

MALICIOUS

PDF

73.1 KB Created: 2021-05-21 15:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f94b9f1ab25925ff9a971b3e56cdc605 SHA-1: 22da0b004534b1283c0c6f76a945bbb97af239bf SHA-256: b74f79441cd64e5d64cfe1c98489dd1544b9873e4195aeaba512ab178d507d67
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by both ML classification and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be related to PDF to Word conversion, which is a common lure for users seeking free online tools. The presence of embedded URLs further supports the malicious intent of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/strik?utm_term=convertir+de+pdf+a+word+en+linea+gratis+en+espa%25C3%25B1ol PDF link annotation
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/5148367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_601d1676cb2da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464720/normal_601ac4b93186e.pdfIn PDF document text
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/suvarufug.pdfIn PDF document text
    • https://pupaxuge.weebly.com/uploads/1/3/4/0/134096873/6405218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427828/normal_600beece8ae0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475212/normal_60658017561f1.pdfIn PDF document text
    • https://kisigitoteke.weebly.com/uploads/1/3/3/9/133997396/webitipo_pugasonitoxib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471235/normal_605b243f00ba2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_5fda725b71924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_6048ed9d662c5.pdfIn PDF document text
    • https://kenuzoba.weebly.com/uploads/1/3/4/0/134017938/84ef4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_604b1cdec5726.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/1c13419c-3ce7-4686-87bd-587f47296dcb/best_software_testing_course_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc925b7-dfa1-4d72-8a6a-cf324d03af97/what_oil_does_a_honda_2000_generator_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a785fa9d-7827-4e3a-806d-3a6ef2fd5a76/juxajisamikumesixobir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aeeffa7-fc88-44c6-9974-2b85f998d733/0-12_months_developmental_milestones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f58e127-e819-4373-a7fa-fba6fd88858a/dd_dark_sun_video_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b781cc-4fa8-462e-96ce-5aee4b947342/ladev.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/66029768371.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/aloha_app_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/get_accident_report_ny.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/276b3633-e7a2-4910-9cb4-6d7be4da686f/33210971648.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/tascam_dr_05_vs_07.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_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 5480 bytes
SHA-256: 80297b4d480b8503a084c682f10eafadea8829b2984504c4cf10cfaab40cd590
font_01_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 11852 bytes
SHA-256: 5687d2cbf486f9d4dc082865283a1dd89d6b7c649e34fdf2561b868c4bc5b779