Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7e05f59dc51910…

MALICIOUS

PDF

79.0 KB Created: 2021-06-01 11:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32db70ae96531d669a4f1bfa53480949 SHA-1: 50a814bb008f7228c2106b02d1a1cf590381b595 SHA-256: af7e05f59dc51910f6c9de419e3ea70c300ff1c2eaa5684ae5ee8beda5c43695
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to drive traffic to malicious sites, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/123?utm_term=school+calendar+deped+pdf
    • https://zujamabosav.weebly.com/uploads/1/3/4/3/134363941/5468360.pdf
    • https://cdn-cms.f-static.net/uploads/4449605/normal_60683db6ef4f8.pdf
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5fec835090c8f.pdf
    • https://rikafikisejale.weebly.com/uploads/1/3/0/7/130740062/punukejinu.pdf
    • https://static.s123-cdn-static.com/uploads/4418764/normal_5ff266305411d.pdf
    • https://cdn-cms.f-static.net/uploads/4389384/normal_6062808fb8d26.pdf
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5fd7a561827c1.pdf
    • https://static.s123-cdn-static.com/uploads/4455387/normal_5fcab0c2beaa7.pdf
    • https://wekigenajelu.weebly.com/uploads/1/3/3/9/133999196/marotogumolodajizo.pdf
    • https://cdn-cms.f-static.net/uploads/4367960/normal_60675e635f6a1.pdf
    • https://cdn-cms.f-static.net/uploads/4456389/normal_60665ba47b4ae.pdf
    • https://cdn-cms.f-static.net/uploads/4462344/normal_6031060300f7f.pdf
    • https://tuxenovizomojow.weebly.com/uploads/1/3/7/5/137516496/sumetazawini_nizidego_davojomo_dozukemidov.pdf
    • https://static.s123-cdn-static.com/uploads/4412379/normal_6002385c34fc4.pdf
    • https://static.s123-cdn-static.com/uploads/4461523/normal_5ffe65d36da0d.pdf
    • https://giwunoxesej.weebly.com/uploads/1/3/1/4/131408529/8788990.pdf
    • https://cdn-cms.f-static.net/uploads/4488807/normal_602a3862c60d3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zemenifinabe.pbworks.com/f/1448114741.pdf
    • https://uploads.strikinglycdn.com/files/aef77691-527b-43e2-bfad-890804dbd7e2/how_to_use_swr_power_meter.pdf
    • https://uploads.strikinglycdn.com/files/039ecc3c-5e56-4676-a44f-ed3a634240c7/11259537480.pdf
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411453/what_is_law_black_law_dictionary.pdf
    • https://uploads.strikinglycdn.com/files/610cf9f5-c5b6-4a7c-8343-b6b265fe22cd/how_to_change_battery_in_omron_pedometer.pdf
    • http://negovijalulu.pbworks.com/f/43454171264.pdf
    • https://uploads.strikinglycdn.com/files/b1e46672-51cf-4a4d-adbe-d0530e955117/50956980952.pdf
    • http://noxixap.pbworks.com/w/file/fetch/144425994/descargar_cambridge_advanced_learners_dictionary_3rd_edition_gratis.pdf
    • http://nowefuro.pbworks.com/f/materi_manasik_umrah.pdf
    • https://uploads.strikinglycdn.com/files/37ddff34-65be-4f27-8ccf-946f0feb52dc/cheats_warcraft_3_frozen_throne_single_player.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f644.bin
7b0168332505d2cd912818062178b74cb5fdf5efa78a6a40bea88c58551f9c16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 5168 bytes
font_01_sfnt_off000107d2.bin
cf6419e0ae7f6a1c2a5b410cfabe008f55356756d7885db16acbf6a78b197744		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 10856 bytes

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