Malicious PDF — malware analysis report

Static analysis result for SHA-256 9509dfc6f143748a…

MALICIOUS

PDF

86.3 KB Created: 2021-03-30 01:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96f12cc1cdea51008765a4cd6b16905b SHA-1: dbeb5088d27967a319765a9c89c960395f684a13 SHA-256: 9509dfc6f143748acd5a9f40f82da6f5d11553e06a92d5b315a396b4d0d02cc6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant number pointing to disposable or unknown-reputation domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting this. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://soxebez.ru/wix?keyword=manual+guillotine+metal+shear
    • https://cdn-cms.f-static.net/uploads/4449602/normal_604866596c275.pdf
    • http://ruvujagefeko.mygamesonline.org/25163709151.pdf
    • http://gosoxegekiri.mywebcommunity.org/carta_de_derechos_de_puerto_rico_resumen.pdf
    • https://cdn-cms.f-static.net/uploads/4417664/normal_5fd673f3dad10.pdf
    • http://konolux.medianewsonline.com/tina_fey_bossypants_download.pdf
    • http://fetoxuk.mywebcommunity.org/96200361241.pdf
    • https://gejejemimegi.weebly.com/uploads/1/3/4/8/134899280/pojotuselini.pdf
    • https://fuxuvaxekanu.weebly.com/uploads/1/3/4/6/134648937/lenakivixux_lifosuxa.pdf
    • https://cdn.sqhk.co/widiroje/eW9gi05/osmosis_jones_video_worksheet.pdf
    • https://cdn.sqhk.co/kepilujofeje/bvSIRhc/21116084740.pdf
    • https://cdn.sqhk.co/lewatesudo/hjujgjb/marketing_job_salary_nyc.pdf
    • https://sarefipa.weebly.com/uploads/1/3/1/3/131398419/ginerebefiragi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/788da54e-6ed0-4941-97d0-e1d0a5fce231/idylis_deep_freezer_not_freezing.pdf
    • https://uploads.strikinglycdn.com/files/d9b6124c-376c-4285-b136-1daa7f51858e/how_much_does_the_bible_app_cost.pdf
    • http://radiviwix.onlinewebshop.net/clasificacion_de_los_seres_vivos_para_nios.pdf
    • https://uploads.strikinglycdn.com/files/11ed69b1-c61b-41ff-b72d-b0e8547fbe08/14789102389.pdf
    • https://s3.amazonaws.com/nuxepiduded/servidor_webdav_android.pdf
    • https://s3.amazonaws.com/zinudipir/sulijubol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001036d.bin
72d6106ce5060d2996bfcefd4a24d23f21d3326197f6e2097d77d646895045ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036D 4988 bytes
font_01_sfnt_off0001142f.bin
1461c217ef3b0d9949368533b4abf5921a3f60e4e6cc9c38909e7638468fa72e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1142F 12552 bytes
font_02_sfnt_off00013dcf.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCF 4324 bytes

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