Malicious PDF — malware analysis report

Static analysis result for SHA-256 086c04544b794a25…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 18:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 84203ab4bc1ec9f959b3883d60aee8ca SHA-1: 87baa343892aad860c1aa9226aed2ca3dbd24ed5 SHA-256: 086c04544b794a2567c7878caf568008f163462d0d34753511efb1860aae5f30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a notable one pointing to 'coretry.ru', suggesting a redirection to a malicious site. The PDF structure and the presence of external URIs indicate an attempt to trick users into visiting potentially harmful web content.

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 https://coretry.ru/uplcv?utm_term=vlc+for+mobile+apk PDF link annotation
    • http://teknis.it/userfiles/files/julanasejipepijofufojegal.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/40153518683.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/vitomululideg.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/36975740456.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c91f90e08---67167067885.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/17312618233.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/nusebobalimujosagekuwadi.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/12836171061.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/73277116330.pdfIn PDF document text
    • http://deforma.it/userfiles/files/81897022979.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-17/20210917233152283319.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/tuvadobebizagumejigojow.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/1240629637.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/28801329802.pdfIn PDF document text
    • http://surtek.biz/image/files/20150401_023641.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/xebibuf.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/zovudopuwifofuwuneviw.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/e4os3ccffiuabb7ojplldc99ni/jubusal.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/91664458233.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/demedepawuxit.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/nivexor.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/51000982253.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/xefemefufivug.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://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_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 17892 bytes
SHA-256: e18b41deef9a4d86434369f3886286492e19aff724359a521ac25a5f68e422eb
font_02_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 10472 bytes
SHA-256: e6b1c0ec1d109ee4ebb0032280604f177e8099626c651ffd68ceaa390ca89d69

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