Malicious PDF — malware analysis report

Static analysis result for SHA-256 4667ad62881ef400…

MALICIOUS

PDF

75.0 KB Created: 2021-05-11 09:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fa128d9aa0d7ffa8e2212dae172a7ab4 SHA-1: 12bb7b46f1221407e9b63f1af6e04ef773796610 SHA-256: 4667ad62881ef400d51a9d5384d7435d3b02236d783f4bcdcd23d7e217a04677
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to known malicious redirectors and disposable hosting, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The primary attack pattern involves luring users to malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=lather+and+nothing+else+captain+torres+character+traits In PDF document text
    • http://xibawolafubiz.getenjoyment.net/how_to_convert_decimal_ratio_into_whole_number.pdfIn PDF document text
    • http://shoplus.info/filmmaker_pro_apk_unlockedh0yk6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446379/normal_5ff9347374f3f.pdfIn PDF document text
    • http://tomandbxof.site/cost_benefit_analysis_in_management_information_system_pptwp50t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374857/normal_6058e02ad26fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392667/normal_601216527f658.pdfIn PDF document text
    • http://all-casino.xyz/606710637718ew0e.pdfIn PDF document text
    • http://bapulesaj.mygamesonline.org/browning_a500_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379839/normal_604ec4a40b263.pdfIn PDF document text
    • http://clobuss.ru/29719404818oynd1.pdfIn PDF document text
    • http://xasanefajisa.sportsontheweb.net/alimentos_anticoagulantes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81ec4de-c8ba-4f69-9b61-d972a967c31a/29421966455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2b3f1c3-08a4-4af6-88dc-62e116bbf4fb/39281330143.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/sentry_1250_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/asus_maximus_vii_hero_lan_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dae07e2-d9b3-4f72-b0c0-19353b34bc37/how_to_cook_a_boston_butt_in_a_pressure_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d21d5b-0ef4-4bbe-a18a-a9e3a17f02a7/how_to_setup_honeywell_pro_series_thermostat.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/19330924669.pdfIn PDF document text
    • http://dapufojutujat.atwebpages.com/32747412034.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/asmaul_husna_dan_artinya_lengkap_99.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/042daf44-fb33-40e4-a502-8ee218b8adc0/golidoxoxeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec4e2fe-d8e7-4c37-bc51-f952963e6b5f/how_to_foreign_currency_exchange.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_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 5276 bytes
SHA-256: 19f5e32da729fa34600facbfb70c76eb061a810169d6ee9a4c2a4ca91ac2d890
font_01_sfnt_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 10300 bytes
SHA-256: b04149225f7d0b41af4b60c32e524a184c3592a683cf9b1a043cd212012f3db5