Malicious PDF — malware analysis report

Static analysis result for SHA-256 37457d09bab4631e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-09 19:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6de4062761924b6cdf4d3580fa1ca90e SHA-1: ecd5f2f0a0609c73060d78ef544dbd38157edbed SHA-256: 37457d09bab4631e7138688ab81508be86d841bcc9669820c76002d21e6f45dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or distributing further malware. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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 http://zbraneklapka.cz/ckfinder/userfiles/files/modifunegiwasutifekedatan.pdf In PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161336a73f131d---jurazil.pdfIn PDF document text
    • http://hainfelderteich.at/wegapafif.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/xonalobetiwigitibobo.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/70163571926.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/rejutifawobovobad.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/46999538342.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/83451321832.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/61427813739.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/33171529258.pdfIn PDF document text
    • http://change4best.ru/upload/file/dujezidiniwopur.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/vewezirimo.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/nolitamujukofunuwowu.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/10539849503.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/firimominamuponiz.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109070827309951.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/mufoledoxunak.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/zapotoke.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/91655859750.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/bifekitupojekupo.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/46233241874.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613546740e630---nozasizegasewebo.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/niluxoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bangla+golpo+book+online+readingPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AD 17480 bytes
SHA-256: 55023980033e0570b48fed40d93f0d8e6c1f034068209ffe6fcd665bcbb82bf7
font_02_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 10584 bytes
SHA-256: ce9070f887353164cc6440cb930938ab5c753c77985ac946b8ae3b7e8a7c6329

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