Malicious PDF — malware analysis report

Static analysis result for SHA-256 fade24acd7c733c6…

MALICIOUS

PDF

70.7 KB Created: 2021-05-14 05:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ab38a6105dd2908cd6a490b861eda9 SHA-1: d42a8f980f22267615c2a1af6a474f810c53b00d SHA-256: fade24acd7c733c682a8fc1f7c3eab705da8f6230df624fa30cebec4b870f205
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs and document body, though heavily obfuscated, suggest a lure to external sites. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=trane+rtac+chiller+catalog
    • https://cdn.sqhk.co/kivipemo/yUjhOie/kidafodalatariforinoporeb.pdf
    • http://buybritishcat.com/how_to_forex_trade_for_freecfs6z.pdf
    • http://spainsale.pro/809617978028uez1.pdf
    • https://cdn-cms.f-static.net/uploads/4427282/normal_6036395bbf994.pdf
    • http://reduslimitaly-ufficiale.site/ihss_telephone_timesheet_system_phone_numberenlk0.pdf
    • https://cdn-cms.f-static.net/uploads/4366400/normal_6052f8df48a94.pdf
    • https://cdn.sqhk.co/mojaribi/PHTbgdZ/hmrc_uk_vat_registration_threshold.pdf
    • http://betmoy54.com/vumizalonejujagivawihg9tt.pdf
    • http://ig-support-service.com/fagokosamaxogepux6qyqn.pdf
    • http://vittorguxx.site/microeconomics_mcconnell86jvs.pdf
    • http://leree4.club/how_to_adjust_concealed_overhead_door_closerfsom6.pdf
    • https://static.s123-cdn-static.com/uploads/4416331/normal_60017a311e3d1.pdf
    • https://static.s123-cdn-static.com/uploads/4480598/normal_5fe1f8eca284c.pdf
    • http://lnstagramoriginal.com/wafewogaramaavtk.pdf
    • http://pifofobexaxel.mypressonline.com/nuance_power_standard_free_trial.pdf
    • http://fenellalucynelle.info/95834729795snwp8.pdf
    • https://cdn-cms.f-static.net/uploads/4446162/normal_604ba1c112680.pdf
    • http://wugupomovupa.sportsontheweb.net/dezuxukajageju.pdf
    • http://ontrade.top/vulematx82a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8139eccc-2b9d-4741-adff-e58bc0f6d2f6/why_did_they_change_the_lead_actress_in_the_crown.pdf
    • https://uploads.strikinglycdn.com/files/14fa3b7e-6eae-430c-87ea-7216cf75f536/a_list_of_character_defects_and_assets.pdf
    • https://uploads.strikinglycdn.com/files/6890b5dc-8671-477e-bd94-ae06eadead98/the_collector_summary_book_thief.pdf
    • http://totuxivez.onlinewebshop.net/what_does_yellow_triangle_mean_on_security_system.pdf
    • http://dirazonun.myartsonline.com/ruzemuxebusilixere.pdf
    • https://uploads.strikinglycdn.com/files/c40a2273-6d7c-47c5-bc94-1e2c2e791da8/27292456446.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_off0000d7fb.bin
12d393271861275143f3b02e07dfe08d2123c3b1053623c21e99bc098fa8dd80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 4832 bytes
font_01_sfnt_off0000e865.bin
86f0427cb3c6e827b490ccd3e4026f450af5669ccc334e8e15eed52e0b58da74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE865 10860 bytes

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