Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f67e73fe244de79…

MALICIOUS

PDF

76.2 KB Created: 2021-02-27 01:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b642c89643d9e2030eaa584b55218784 SHA-1: f2ea38ce0e39cec4de4939dfed9d012823e68188 SHA-256: 4f67e73fe244de79a4bc86fb0a60e40201fd5898e794986d2a292329e0c779b8
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to host or redirect to a malicious payload. The document body, though heavily obfuscated, contains text related to free music downloads, suggesting a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=chatal+band+mp3+free+download+naa+songs PDF link annotation
    • http://nopotaz.medianewsonline.com/gobimu.pdfIn PDF document text
    • http://gemomubogobupo.22web.org/produccion_de_acidos_organicos.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/fepanabazudidimkv9k7.pdfIn PDF document text
    • http://coloradocustomelectric.com/genipajululegu0t62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_5fe96a4184adc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473445/normal_60343a3f8300e.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/gre_quantitative_comparison_questions.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/ielts_opinion_essay_structure.pdfIn PDF document text
    • http://reduslimitalia.site/amrit_maan_video_song_differencetoa2k.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/bezab.pdfIn PDF document text
    • http://mavisuvegepufi.iblogger.org/does_king_die_in_seven_deadly_sins.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/posufij/medical_terminology_chapter_2.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/xidofimometozusoduka.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/blank_notebook_paper_template_for_word.pdfIn PDF document text
    • http://roxutudutupit.epizy.com/rematomavite.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/gw2_guide_elementalist.pdfIn PDF document text
    • http://lagarudu.epizy.com/java_8_for_ubuntu_64_bit.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_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 5756 bytes
SHA-256: 675ddd9a1890f1aa1d6abc347493f116a558dddeef2eea8f78f4bf34dc2efdba
font_01_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 11260 bytes
SHA-256: 4e8491ba90f7efe74a058730ff2e65bb8c8bc870170ede8d408ef5ec7edc8ac1

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