Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a197397621ea063…

MALICIOUS

PDF

75.7 KB Created: 2021-03-28 23:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cdfaeb1e4077643aedf92b753c278ed1 SHA-1: 9823254584052522a7185fd2fe322a471b00de15 SHA-256: 4a197397621ea063633bf0ae03e0fdcd8906e912ab80877d6da7fafe3ecded8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dafemum.ru/wix?keyword=unblocked+movies+2016 PDF link annotation
    • http://wofeboz.66ghz.com/jepukozematigeluvupajel.pdfIn PDF document text
    • http://abreudesigns.com/10465068632wxb5s.pdfIn PDF document text
    • http://reweder.site/pazilanebh8vo1.pdfIn PDF document text
    • http://forexgeeks.net/jonisepupigirnu3ux.pdfIn PDF document text
    • http://matroskin.space/158077725784er97.pdfIn PDF document text
    • http://xujimutisep.iblogger.org/contributed_capital_in_balance_sheet.pdfIn PDF document text
    • http://vedefufedogoke.iblogger.org/aprendizajes_clave_secundaria_lengua_materna.pdfIn PDF document text
    • http://satogolijosefas.iblogger.org/changeling_the_dreaming_espaol.pdfIn PDF document text
    • http://reggis.info/gufefibudedemadixhh0un.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/e01e96ed-2a9c-4806-bab8-d5a7a782174b/how_much_weight_can_i_put_in_my_dodge_ram_1500.pdfIn PDF document text
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_24a03dad9dba47c99fd454c643a6a2a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9b6829-8f19-48ed-a0ff-7c033d515333/python_basic_programming_interview_questions.pdfIn PDF document text
    • http://webuxaxove.rf.gd/web_application_security_testing_interview_questions_and_answers.pdfIn PDF document text
    • http://zakusomob.rf.gd/2011_chevrolet_cruze_owners_manual.pdfIn PDF document text
    • http://rajeripevexe.rf.gd/drawing_exercises_for_beginners_books.pdfIn PDF document text
    • http://gadudadu.rf.gd/sengoku_basara_2_heroes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd3ae410-e70a-42b3-aeae-edc194a05141/raymarine_c120_dimensions.pdfIn PDF document text
    • http://dozipaju.rf.gd/57243131929.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_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 5516 bytes
SHA-256: 71ac580a2742fa3ee8d9facd2fcaa0a2c7d9433122f7548b202f047e03cdcee6
font_01_sfnt_off0000fb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB82 11292 bytes
SHA-256: b9bebe9ee466cdb1260183aea494f49b6b38f0959f9865089ced07f77a824414