Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4b00bd6c913b04…

MALICIOUS

PDF

77.9 KB Created: 2021-04-18 00:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7760e1615f3042f99997df3f688080a8 SHA-1: f19217b84794f95632281b5442ccfff81a392dc9 SHA-256: da4b00bd6c913b0441653663a1593558c159b381493ea9ae492f31fdd7b45190
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the links are part of a scheme to distribute malware or conduct phishing. The primary malicious URL identified is https://soxebez.ru/strik?utm_term=vc+generator+2k16+no+surveys.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=vc+generator+2k16+no+surveys PDF link annotation
    • http://zefutuwukeras.getenjoyment.net/fupisetu.pdfIn PDF document text
    • http://kurekarer.22web.org/teacher_created_resources_inc_3799_world_geography_answers.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/59325436865.pdfIn PDF document text
    • http://livitopav.22web.org/where_are_the_waterfalls_in_last_of_the_mohicans.pdfIn PDF document text
    • http://vufilulojusabid.iblogger.org/performance_parts_for_jeep_liberty.pdfIn PDF document text
    • http://duboxol.iblogger.org/data_warehouse_vs_data_lake_vs_lake_houses.pdfIn PDF document text
    • http://jogixokixese.iblogger.org/96132956834.pdfIn PDF document text
    • http://novazeku.mygamesonline.org/84778987763.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefeluxezilire.epizy.com/92203499033.pdfIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_8a6275841ab2487db1a75d90e1e39dec.pdf?index=trueIn PDF document text
    • http://numivonef.rf.gd/norton_antivirus_security.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/889e2a92-014f-42b2-ad78-593316a1a46e/97027742151.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_fb1c853e106747aa89cda82efca6d885.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f01f0e25-dd94-45c6-b9f1-0eea7be52a3c/68107953023.pdfIn PDF document text
    • http://sajorasuxanuvil.epizy.com/amazing_grace_sheet_music_violin.pdfIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_7b9c6d01505e48fca6d0c43cb8bc5f40.pdf?index=trueIn PDF document text
    • http://sapirilogive.epizy.com/customer_service_experience_interview_questions_and_answers.pdfIn PDF document text
    • http://tamipaw.epizy.com/gagadidisa.pdfIn PDF document text
    • http://pitidurafekuji.rf.gd/nelogabovejana.pdfIn PDF document text
    • http://numivonef.rf.gd/bootstrap_navbar_template_animated.pdfIn PDF document text
    • http://ritebononopa.epizy.com/architectural_acoustics_book.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_4242ebfc38cf4896bdd720b563ca5ff2.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_a88dbaa5b97f4d6280e9131f3450c331.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5406d1-97db-4f24-b1cd-9f5f0b3e38d9/katexebopifelafodolefaf.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_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 5464 bytes
SHA-256: fc3e8bf4ba8d1fefb34a468f6ffae0102ef7da63e6680e5b08512e582c3ac048
font_01_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 11112 bytes
SHA-256: feb758ad08431d23275aaf1ee1fe218f7da5975bb8760d1a3a07656776983b68