Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dea790671e2fc0c…

MALICIOUS

PDF

90.3 KB Created: 2021-05-01 10:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bb60d9783d4cf55675d921cd7b81b843 SHA-1: 39eb6ef3a17b57349482be3286ca9d45fd6a19ea SHA-256: 2dea790671e2fc0c6860aa1a142a668c406c28980f1c94196ebb74296867bd13
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, and is flagged by heuristics as a link farm and by ML classifiers as malicious. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/strik?utm_term=where+to+watch+alex+rider PDF link annotation
    • https://cdn.sqhk.co/xugosovemi/cgdJTa9/2020_nfl_football_schedule_raiders.pdfIn PDF document text
    • https://cdn.sqhk.co/mewowoji/5jhjehh/used_weekend_warrior_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_600a146531c9b.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/cassida_5520.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/mesabigexajibulaguvexeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464852/normal_6008ff90ecc8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461211/normal_6067c783c36ce.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/MgOAVie/rovirevis.pdfIn PDF document text
    • https://cdn.sqhk.co/dufadafakuti/hDgghhi/68927491418.pdfIn PDF document text
    • http://zifeladawu.scienceontheweb.net/10230075613.pdfIn PDF document text
    • https://cdn.sqhk.co/tumitibira/jybZCjj/canon_i_runner_2530i_multifunction_printer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/aprilaire_thermostat_stopped_working.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/microsoft_excel_test_case_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/350a8e19-fa53-444b-bc0a-735db46add89/can_i_change_my_drivers_license_address_online_in_mn.pdfIn PDF document text
    • http://zajupulavofawi.myartsonline.com/jolifosimaxafosojeg.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/47772571571.pdfIn PDF document text
    • http://xanedemu.onlinewebshop.net/bhushan_steel_case_study.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dfd3939-88d0-4314-afd0-7ac607f1c48e/what_aggravates_piriformis_muscle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af8707f-e587-4d8f-bb94-296d2305a06b/conversations_in_american_literature_chapter_3_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/copd_gold_report.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/70041435494.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_off0001252c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252C 5024 bytes
SHA-256: 9656de70ebba0b66b39d02af234b2383fcf1e53a1afeaa7e910b2a46e289d365
font_01_sfnt_off00013655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13655 11084 bytes
SHA-256: 29dfa7b15fd8acd291b1daf37a4c1bbf70bf760ef447aa4c08f3f0f0bfde4b21