Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bafb705aadef65…

MALICIOUS

PDF

84.7 KB Created: 2021-03-15 22:17:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f6cd94b7fcac203d60bcaf1e2ee28413 SHA-1: b3785162c8743387cfb09bcdb32d0071a0f52108 SHA-256: b6bafb705aadef6522edfb7496e8deb42ccf343d2dfb07697d0a0e7eca90b26a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://jottigo.ru/strik?utm_term=symphonie+fantastique+3eme+mouvement PDF link annotation
    • https://cdn.sqhk.co/mezawuso/T2BjcNR/bouncing_ball_gif.pdfIn PDF document text
    • http://nijuwebil.iblogger.org/58320807581.pdfIn PDF document text
    • https://cdn.sqhk.co/wofikubid/jajhG6Q/wildlife_puzzle_story.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445557/normal_5fc86d6907f19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_60160ece20e9d.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/FigWcgj/oscar_grant_movie_death_scene.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/gr92Ooa/thorogood_boots_1892_beloit.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/hg2PkiR/best_place_for_marketing_jobs_in_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawomo/fquN5ih/nolevuva.pdfIn PDF document text
    • https://cdn.sqhk.co/mixubiki/ibTXqYs/8268889128.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/Ggel6gc/digestive_enzymes_benefits_for_skin.pdfIn PDF document text
    • https://cdn.sqhk.co/pasivuzuke/ZBhhqgi/what_animal_are_you_test.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://foxutusida.epizy.com/21715348696.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_298b5027c5d84ffcb13284c37640a40b.pdf?index=trueIn PDF document text
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_b2112ad120834ffd8a5f043b4a1a4fd1.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_99d2ff0ed83245ad9568a8ce795eb141.pdf?index=trueIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_6320690994e3491b91a7d61b5b1d64b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b6863c-ee1c-4e11-8e1b-c782f06f194c/fekimegefosoxos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e76cff6-aab6-45fe-9835-634d4222fa2c/manual_de_tcnicas_y_terapias_cognitivo_conductuales_uned.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9ae39c9-7ed4-4bb4-8e61-36e95ca04df0/cloud_computing_tutorial_point_videos.pdfIn PDF document text
    • http://mujodefifotufe.epizy.com/spiderwick_chronicles_2.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_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 5568 bytes
SHA-256: 706554b5240574faa917b1199036ac8234a490e45335586863dca9a306448dd0
font_01_sfnt_off00011acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 13092 bytes
SHA-256: b489485df933f9d97c06b72bc803da2f0fa892ed5815cdb2271ca42d295fc03d

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