Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9396865e814f2f7…

MALICIOUS

PDF

76.6 KB Created: 2021-02-25 08:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 59112d7e3dc80bb5619c5cbde23a96c8 SHA-1: 310a84b6dfe33540340ece2ad4a09841a4e1fdfa SHA-256: f9396865e814f2f7c0d214033669d70cb5b35e450784b609eda4c224d41998b3
126 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wb?keyword=cuanto%20vale%20un%20metro%20en%20pies PDF link annotation
    • https://cdn.sqhk.co/fovipobex/4jfxKWW/tubagiritojewe.pdfIn PDF document text
    • http://bajelow.iblogger.org/simple_apartment_rental_agreement_template.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/yXhfja6/18517188842.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/how_to_make_corn_bags_for_toss_game.pdfIn PDF document text
    • https://cdn.sqhk.co/kelifevaz/f0H0rUx/facebook_app_download_for_pc_windows_10.pdfIn PDF document text
    • http://xovonakajo.22web.org/58915094674.pdfIn PDF document text
    • https://cdn.sqhk.co/butiluluvuk/NOMgfJ4/academy_sports_apple_watch_bands.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/how_did_the_maze_runner_1_end.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/metroid_prime_4_release_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466370/normal_5fda7f043ee70.pdfIn PDF document text
    • http://vibigalobonewil.iblogger.org/baixar_musicas_gratis_para_celular_android.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/giUgege/wapuro.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/dhcysJb/73214064115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416128/normal_600b24fa7f026.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/tp_link_powerline_management_utility_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_601ede0556f45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/40060509986.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_off0000e541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE541 4932 bytes
SHA-256: 9c157d93b53b41a4291db8c62de2ba3dd84cfdf20aa5847285a50bff6e6632ec
font_01_sfnt_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 14924 bytes
SHA-256: 84e487648b49a05164205616b1bf9017a4d915f31ba3c3837141aaa040ebe2c3

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