Malicious PDF — malware analysis report

Static analysis result for SHA-256 112fa0dc4bae5742…

MALICIOUS

PDF

72.9 KB Created: 2021-01-26 08:28:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bea4e855a746384612aa0697b5a75ac5 SHA-1: 8abe062ba97224436b0b5cbb408e3673f140fd9e SHA-256: 112fa0dc4bae5742979b666918ff940d7fe8d696763880646749a22ed4ce70ad
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. One prominent URL, https://jacksth.ru/wb?keyword=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C%20%D0%B2%D0%B7%D0%BB%D0%BE%D0%BC%D0%B0%D0%BD%D0%BD%D1%83%D1%8E%20%D0%B8%D0%B3%D1%80%D1%83%20russian%20moto%20traffic%20rider%203d, appears to be a lure for a game download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/wb?keyword=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C%20%D0%B2%D0%B7%D0%BB%D0%BE%D0%BC%D0%B0%D0%BD%D0%BD%D1%83%D1%8E%20%D0%B8%D0%B3%D1%80%D1%83%20russian%20moto%20traffic%20rider%203d PDF link annotation
    • http://registrat.space/oval_solitaire_ring_enhancerg54n8.pdfIn PDF document text
    • https://fazafunapogaz.weebly.com/uploads/1/3/4/1/134131986/f6f2e805a.pdfIn PDF document text
    • https://cdn.sqhk.co/joxutedunik/1jb9kih/coloring_games_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/ifgdhau/police_mission_chief_crime_simulator_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kovezozeseg/1wjhHOJ/wijofijasakepe.pdfIn PDF document text
    • https://kowexemi.weebly.com/uploads/1/3/1/8/131872048/fukulur-jasarikimu.pdfIn PDF document text
    • http://mmmuuuue.space/huawei_health_app_not_working_after_updateza10i.pdfIn PDF document text
    • http://tepuragebu.iblogger.org/airdrop_compatible_android_app.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/ronatiduzoxij/gememakutobup.pdfIn PDF document text
    • http://gizimup.epizy.com/hebburn_comprehensive_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/welavekatitir.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/jurnal_titrasi_asidi_alkalimetri.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/jixonuzenijegogaxukadixep.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/suwukekiwopabolugotubeta.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_off0000ce8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8C 6972 bytes
SHA-256: a693b5fad8041e7ed7d10471aa1f2cec9de740681eac7c65a0ce37dfdf273aa4
font_01_sfnt_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 14988 bytes
SHA-256: 47184df3a2ba10fe7a596220d47c8fe72f08720481661f4c7c12d19c096aca48

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