Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6bd4ad19f5a011…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 15:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e181b8051a5df73d7e4224ac6b5eb70e SHA-1: 9ad90ec63d35987321453a4188e6c7a0d913f60d SHA-256: 9b6bd4ad19f5a011510385e68d943709df478a5bd8c275f0860f28d2d2c14979
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://garglob.ru/uplcv?utm_term=video+call+app+mod+apk+download PDF link annotation
    • https://globalcircle.club/userfiles/file/lododifem.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210907011328.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/88860110803.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/kidumurejudur.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/guzakulimepujikimubase.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/wibepete.pdfIn PDF document text
    • https://hse.tw/upload/file/7968134554.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130591f93ad2---83000034884.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614631dc74cfc---31864041497.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/suwewabipodunefezusevigup.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/17962735712.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/lipadikanarugutagut.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/73648071335.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210911001209.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/81034256074.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/monaxosajekorajuvarofe.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/40944371850.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/bejedilovonexabofaf.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d566274d701289327a813062cf73253c/41464235526.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/17125175639.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/28419844040.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/6206847427.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210916/file/16317271851486.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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 10456 bytes
SHA-256: 124af982bdac21692fbb60b1df93ee247f3f581573dbc324d2d708906b258a81
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 17020 bytes
SHA-256: 9ef383777d98267b37552074e75178525e2018bb72ce5a06b3a90df7ae22e495
font_02_sfnt_off00011eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1