Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef8a8a0f0c9a7d8…

MALICIOUS

PDF

79.7 KB Created: 2021-05-07 01:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4f9690f6b5ac1ba091f46e51dfbbea7a SHA-1: 072c695c845206708ac8129f9ed952a257fa9bb9 SHA-256: 5ef8a8a0f0c9a7d8ba5bd9813429b700d01bccf2edfa6364d11ac9ce82a31882
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, including one pointing to 'ponafet.ru' which is associated with a link farm heuristic. The document body, though heavily obfuscated, suggests a lure related to 'interior design assistant jobs chicago'. The presence of external URIs and link farm characteristics strongly suggests an attempt to redirect users to malicious sites for further exploitation.

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
  • 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=interior+design+assistant+jobs+chicago PDF link annotation
    • http://omynutural.space/1192900372dm8ih.pdfIn PDF document text
    • http://dreamingdeveloper.com/honeywell_9_series_wireless_portable_doorbell_with_halo_light_and_push_button_-_rdwl917axg734o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_60274b94c8cb7.pdfIn PDF document text
    • http://vkrowl.com/39135020969ec7l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_600c1c237fca6.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/pazedidalotoketiwig.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/48826979114.pdfIn PDF document text
    • http://kisizifavo.getenjoyment.net/notting_hill_carnival_route.pdfIn PDF document text
    • http://leopards.space/loan_interest_calculator_excel_sheet7xgvk.pdfIn PDF document text
    • http://egrn-order.online/how_to_renew_my_food_stamps_online_azm7ocn.pdfIn PDF document text
    • http://dresdenpharma.ru/dyson_ball_vacuum_dc24_troubleshooting9o46x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://numaxap.epizy.com/building_acoustics_and_vibration_theory_and_practice.pdfIn PDF document text
    • http://xafuwotu.rf.gd/23397118784.pdfIn PDF document text
    • http://puredaw.rf.gd/guretuvekajilora.pdfIn PDF document text
    • http://nerifumufuzu.epizy.com/likevixudumosobatugoti.pdfIn PDF document text
    • http://biburusig.myartsonline.com/60869735426.pdfIn PDF document text
    • http://solugivewatewa.myartsonline.com/agile_development_in_software_engineering_slideshare.pdfIn PDF document text
    • http://seromol.epizy.com/netherlands_post_tracking_number_format.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_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 5320 bytes
SHA-256: 0b108406d55693e06aad36b138989017eb3391c8757fa2bfab8e24cb4f459672
font_01_sfnt_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 10904 bytes
SHA-256: 3c1f4609d449d179da2d8865213af7d32a93e10cfbce6402bb43b61a04035511

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