Malicious PDF — malware analysis report

Static analysis result for SHA-256 998db6f8c3a53034…

MALICIOUS

PDF

78.5 KB Created: 2021-02-28 22:23:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1aacbcc8c143be28977ec1d0bb241a7b SHA-1: bf5c5aeb7720a40cabce9f9c8bb460777cc6202a SHA-256: 998db6f8c3a53034e7b2a312c86cb7d575be723edbf3826ac292852bbac41bdd
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains keywords related to a class action suit, suggesting a phishing or social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=electrolux+refrigerator+problems+ice+maker+class+action+suit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_6027d3a43494a.pdfIn PDF document text
    • http://itayoga.space/reporting_anova_and_post_hoc_results7rrlg.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/gixegaxadunudazavapobispm495.pdfIn PDF document text
    • http://buloshnaya.site/mountaineering_gear_reviewsqtu27.pdfIn PDF document text
    • http://gufutaca5.xyz/pofemulabopotavcrxt3.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/geDgclF/realistic_gun_shooting_simulator.pdfIn PDF document text
    • http://thepropheticapp.com/c1900a_router_manuallkoio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482218/normal_6037af5394c0a.pdfIn PDF document text
    • http://sentytld.online/in_modern_periodic_table_zigzag_line_separatesp4gr9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482848/normal_5fdebeae34b6f.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/jjApGTj/jebupinake.pdfIn PDF document text
    • http://mignonette.space/zorobojiqx71a.pdfIn PDF document text
    • http://freud.icu/black_wallpaper_image_free1hm7r.pdfIn PDF document text
    • https://cdn.sqhk.co/jasuxerazifo/iYWijhc/9422726150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413843/normal_600cb2042a877.pdfIn PDF document text
    • http://svoydvalend.xyz/top_100_games_of_the_decade_ignxrjzh.pdfIn PDF document text
    • http://criticcxck.space/biomechanics_of_walking_running_and_sprintingar7yg.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/mavixu/terraform_infrastructure_as_code.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/que_chocolate_se_puede_comer_en_la_dieta_cetogenica.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/flushing_food_guide.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_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 5564 bytes
SHA-256: a7551afdd047ec3cebe8ead81f32a6b94ea3aa7f1c802d4f6cdf16867ddc5412
font_01_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 11504 bytes
SHA-256: dfb087b4240738a93c264c16ed54d493a7ca6a8a563ce4682a9a78629b545464

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