Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bdbf33f7d5b2eb…

MALICIOUS

PDF

77.3 KB Created: 2021-03-20 09:25:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4c736c65e0d4a7fe4e9258b988785f68 SHA-1: ae98192ad81dfe19b3f258f8ac015db3ac1bb340 SHA-256: 82bdbf33f7d5b2eb1e5555306665916d6e57d86de242935e3afe00ba04065c9d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous external URLs pointing to other PDF files, likely for SEO manipulation or to distribute further malicious content. The presence of external URIs and the 'link farm' heuristic strongly suggest an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=darwin+2.+0+pdf PDF link annotation
    • http://texno3ua.com/how_to_pair_xr2_remote_to_cable_box0xtu9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_603b623c6f874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_602fad434e929.pdfIn PDF document text
    • https://cdn.sqhk.co/midijanere/icZgfgi/music_player_equalizer_app_download.pdfIn PDF document text
    • https://wexemexaxixu.weebly.com/uploads/1/3/4/7/134709907/zuxadoxe_xilifonegixal.pdfIn PDF document text
    • https://cdn.sqhk.co/gajerivab/lk7haje/anime_x_wallpaper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478687/normal_602083ec159db.pdfIn PDF document text
    • http://lessonsonline.site/pepopv8yvk.pdfIn PDF document text
    • https://fujinimozebuxe.weebly.com/uploads/1/3/0/7/130738673/9614321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412158/normal_5fd6609fa5dfa.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/ggcBLrq/nisifizalobifoliximanoke.pdfIn PDF document text
    • http://alexsaf.ru/formatos_de_solicitud_de_empleo_para_imprimir_gratisahnkw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495271/normal_6054399ff1034.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/Oahiib6/besabowisinagasigoredav.pdfIn PDF document text
    • http://airned.ru/13739062564cis60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_b4a1125947324340a1ffa06ed02c7e7b.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_076a47cd779c43299ced562d435c6e6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/020296f0-7926-4a9a-ae36-0e50fcc38f69/pasenukolomode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88960bc-b689-4979-beb0-921469832829/black_and_decker_electric_string_trimmer_manual.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_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 5220 bytes
SHA-256: 7e3b87f4c70f2e3a0ee2a6b85f295fbd89912a34b6ce897e0e225e062424e819
font_01_sfnt_off00010213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10213 11352 bytes
SHA-256: 73116179afd904d28c7184789edd810d43db2686869aff18475acb92fc695c9c

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