Malicious PDF — malware analysis report

Static analysis result for SHA-256 290eda8688893c75…

MALICIOUS

PDF

80.9 KB Created: 2021-02-28 01:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 06ed51d483e1d4b82231b4526c610747 SHA-1: 4f9fedb274fadf39f5d9aba982ade542d8510134 SHA-256: 290eda8688893c7531cfda6e81ed6737e963d5d5aeb1591310aaa3ae196626fc
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains or link farms, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs supports a phishing or malware distribution attack pattern. No scripts were extracted, but the overall structure and URL distribution suggest a lure to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://fokemale.ru/strik?utm_term=real+book+jazz+pdf PDF link annotation
    • https://cdn.sqhk.co/vivepovugeli/qbgiS3P/straight_rhythm_racing.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/gewzdJO/weapon_builder_pro_apk_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461497/normal_602428d932327.pdfIn PDF document text
    • https://cdn.sqhk.co/fajoliteve/jgggiaK/progressive_neurology_hackensack_nj.pdfIn PDF document text
    • http://najefot.22web.org/hp_photosmart_5510_wireless_scan_to_computer.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/zukiluvetelepororof.pdfIn PDF document text
    • http://help-bluebadgecustomer.com/627978905387k7rm.pdfIn PDF document text
    • http://gawoxubut.22web.org/50445431727.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/5zgeggD/xaxaj.pdfIn PDF document text
    • http://hermidkovo.info/monthly_expense_calculator_excel_spreadsheetj4t4a.pdfIn PDF document text
    • http://nepatokada.mypressonline.com/7607100647.pdfIn PDF document text
    • http://zodoworusa.22web.org/middle_east_attendance_management_software_free.pdfIn PDF document text
    • http://shoop-fr.ru/944111080423fbi7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zekovulelopur.epizy.com/sususopexanixusotafebopi.pdfIn PDF document text
    • http://tijunejo.epizy.com/11854971377.pdfIn PDF document text
    • http://vabagez.rf.gd/rustoleum_cabinet_transformations_on_laminate_reviews.pdfIn PDF document text
    • http://xanunomoz.rf.gd/auto_clicker_roblox_ro_ghoul.pdfIn PDF document text
    • http://buvodadixasiz.epizy.com/rukojoleverilesujit.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/what_were_the_three_colonial_regions_in_early_america.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 5096 bytes
SHA-256: f5275c68546737a3ebbcc57c202d49638b59cfefd16b2ca4ab011c8230f9cf21
font_01_sfnt_off0000fb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB42 11236 bytes
SHA-256: f29306a7f3021fa4a099d68f5d5680ea6e77f3716165a3b1fd03e6ca8722dd31
font_02_sfnt_off0001216c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216C 16120 bytes
SHA-256: 2cfc97915d250804213c9b0e6ad261e0979cd38371fb36ec9174dea58a153a3e

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