Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee160bad77e5ea4a…

MALICIOUS

PDF

131.1 KB Created: 2021-06-07 16:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 480dda0f2ccf9056e2ed1852b04fbe81 SHA-1: 5be496e44b3f654da25d87bb1c7fc08bede4a474 SHA-256: ee160bad77e5ea4a081f29d3e83826445a9dd4d3f3e222ec4023ca329d161a8d
126 Risk Score

Malware Insights

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

The file is a PDF that contains an embedded URL pointing to a suspicious domain, flagged by heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, appears to reference a workbook, suggesting a lure to trick users into visiting the malicious URL. No scripts were extracted, but the PDF structure itself is indicative of a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://krisoc.ru/pbw?utm_term=big+ideas+math+algebra+1+workbook+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381978/normal_5fe1e8e513ba1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454289/normal_6005584517d75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_601972e646ce7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5fc98fbda0a5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379229/normal_5fc7bd9886fab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_6025b2fb94aa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476268/normal_605d8ab58fafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_6047c68fe331f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505096/normal_5ff64bb435dbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_6044fe758df96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501233/normal_5fe3ea8adb460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_601f11968bca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_60135fa63432c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_606e466619f22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530712/normal_6023096ed2947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462694/normal_602eec913027a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/168440c4-7051-49fb-b3d9-10055b487092/how_to_tackle_climate_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afe4acfc-b8ba-4d56-b70d-cb1c521b953a/what_kind_of_treadmills_does_golds_gym_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c647d49-8656-49fd-a3f5-178f2875f612/wireless_n_wifi_repeater_password.pdfIn PDF document text
    • http://suniger.pbworks.com/f/aesthetic_neat_handwriting_font_practice_sheet.pdfIn PDF document text
    • http://vowijeve.pbworks.com/f/kirkland_applewood_smoked_spiral_sliced_ham_cooking_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2132f9fe-78bc-42f1-b046-e78143cc3fe0/how_to_reset_swann_h_264_dvr.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/f/93605543599.pdfIn PDF document text
    • http://xotokuwawa.pbworks.com/f/descargar_discografia_completa_del_binomio_de_oro_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25664862-c8bd-4fbc-9101-661d0da1832b/what_is_the_independent_variable_in_a_pendulum_experiment.pdfIn PDF document text
    • http://kuxuraroj.pbworks.com/f/rikunobagimiluratuwiv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6ED 5852 bytes
SHA-256: f55c112f71f203a1698883266951283d424199ff2072892830340be9aa61a0c3
font_01_sfnt_off0001cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAC3 2048 bytes
SHA-256: f3f1156433f07cbcd2613c1bd636b864e8581fbc6388c717c5c7285e0f3daede
font_02_sfnt_off0001d3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3A5 12420 bytes
SHA-256: 09947993411f73f49d991f3fa0395d7067507fad22d989924d7d1bf6b5806a17

Open this report in the interactive analyzer, or submit your own file for analysis.