Malicious PDF — malware analysis report

Static analysis result for SHA-256 2125cf867c449f55…

MALICIOUS

PDF

74.8 KB Created: 2021-09-20 15:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: afc826fa2bf386ff5f06aee65235a2ea SHA-1: 784fa72ba0f0fd149b98133bf645cba8bdf62f4e SHA-256: 2125cf867c449f55792af33bbf0e28336b602ac76d50d0aaf6c1bf04dd279105
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to a link farm, suggesting a phishing or SEO manipulation scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, reinforcing the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.sudeshnamaulik.com/fckimages/file/48024371069.pdf In PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/zabufewudasibeza.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/kiboxetelavipizak.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/sebixasabomi.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/54009520359.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/631c28df027da4569f93cb16dc55f03c/40565385343.pdfIn PDF document text
    • https://bem-sa.com/img/file/30032204121.pdfIn PDF document text
    • http://th-hl.com///upload/files/mobasew.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/wuwasobonitobe.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210909_082731.pdfIn PDF document text
    • https://tessuno.com/upload/files/613e477d0f7b8.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/mufonafevubilegilotazev.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/zunixuxutefamuwatijemena.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109200635199091.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/89410057466.pdfIn PDF document text
    • http://presupuestos.pavysan-bigmat.es/ckfinder/userfiles/files/zelelinapuwelezefimoru.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/bumujozunez.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/43192149873.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/5545636146.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/58712261233.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/lizujusinevorenamikoneni.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/52296963618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=brain+wash+amazing+jigsaw+puzzle+game+downloadPDF 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_off0000bff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF3 17008 bytes
SHA-256: ec1f0bcb88825594a6545a83ca095f90d0674ac88585347bcd1a5a658237ae80
font_01_sfnt_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001035d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 11172 bytes
SHA-256: dcb762bf914651bdfc5d516cecf3d1af52fe60ce40827a4802aa02bfa3ca9faf

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