Malicious PDF — malware analysis report

Static analysis result for SHA-256 4989c87776f7fcc5…

MALICIOUS

PDF

72.2 KB Created: 2021-04-07 00:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e7cee4c4eefdae0c586065f94c57925 SHA-1: e5c7b61eb0516c5c90f82b3953b751f76a8f310b SHA-256: 4989c87776f7fcc57fbceb7c9780a510ab40945ed84ce5f9a2456b64dd5122ee
124 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, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6714

Heuristics 4

  • 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
  • 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://dugedepap.ru/award?keyword=tesis+descriptiva+comparativa+pdf
    • https://cdn-cms.f-static.net/uploads/4422638/normal_6030cd74430cb.pdf
    • https://cdn.sqhk.co/tuxonewebuke/hIkr3fO/pentagon_federal_credit_union_reviews.pdf
    • http://dudoxanudito.scienceontheweb.net/pizerurimamojalunizo.pdf
    • http://pasiworuwiwoz.getenjoyment.net/nexilugaloxixuw.pdf
    • http://difijeso.iblogger.org/which_is_true_calvinism_or_arminianism.pdf
    • https://cdn-cms.f-static.net/uploads/4379732/normal_6060421eea5a8.pdf
    • http://gomesuzos.mypressonline.com/rate_zonal_centrifugation.pdf
    • http://zanedasimitavo.22web.org/marketing_master_thesis.pdf
    • https://cdn-cms.f-static.net/uploads/4419001/normal_6035555d364c0.pdf
    • https://cdn.sqhk.co/kuburarimoku/giHjhgf/37886457623.pdf
    • https://cdn.sqhk.co/losegiro/EHihO2D/spaceballs_all_characters.pdf
    • http://zegofivuwirukon.22web.org/julumimobipuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/08c80078-c6a2-48d8-af77-d90450730e81/tevitapiturepixipaxunig.pdf
    • http://biburusig.myartsonline.com/effects_of_water_pollution_download.pdf
    • https://uploads.strikinglycdn.com/files/6d1141f7-1528-4225-bc7b-b4164224888d/how_to_write_a_conclusion_for_a_chemistry_lab_report.pdf
    • http://xutarefes.epizy.com/anatomy_for_3d_artists.pdf
    • http://litorow.myartsonline.com/types_of_computer_hardware_and_software.pdf
    • http://ruraruke.epizy.com/un_romance_irresistible_mary_balogh_descargar.pdf
    • http://lobosutu.epizy.com/28989672958.pdf
    • http://nofixuzupebo.epizy.com/nosadukovenavamitep.pdf
    • http://nizalag.rf.gd/spreadsheet_applications_fbla_practice_test.pdf
    • http://juvuzonowokogu.rf.gd/ge_amplified_indoor_antenna_34700_manual.pdf
    • https://uploads.strikinglycdn.com/files/29d6b08e-c1c2-4738-8a69-75ab457ad8fd/banakapa.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec92.bin
4994a5fc9290d0592acc386db6fff3916509b235049ab7265ddad4903b8adb18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC92 5276 bytes
font_01_sfnt_off0000fe75.bin
124cf863c69ea563d8d8fca438291ce24cf8eadcf898b7ebc076a4af611e7822		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE75 11268 bytes

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