Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea102a713976a7a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-25 08:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02f98a01872962741f1ecaf8655623ee SHA-1: d1bd6f883ddf715a6af06336f65dad4cd6d4925d SHA-256: 8ea102a713976a7a9088c3968f68e2e14b2c52880e24584f7a9f5c9f8b4c40f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'inwebjor.ru', suggesting it is used to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=ship+info+apk PDF link annotation
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/61dbc4f734ea6ccb8da1bcdb6414692e/9713174439.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/99590118282.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/18992221035.pdfIn PDF document text
    • https://geloracinta.com/contents/files/nutukikojetirupuba.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/64024564454.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/vobubonimuge.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/zotawabekuj.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/21397216945.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/vuvifegegenimo.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/54587714287.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/65923193780.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/solekuvanulefidufurux.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb722ec373---60169002413.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/81478521658.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/68968339149.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/fekifebejir.pdfIn PDF document text
    • http://446888.top/userfiles/file/49024834246.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/72422525403.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/nirubuvazoxogavelawe.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/fogurarugiwuxoronu.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/52449405599.pdfIn PDF document text
    • https://nexapos.com/upload/files/47903763624.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/74968192717.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_off0000b9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F5 19340 bytes
SHA-256: e055aeaae835067c33c3b73df50b3c8ffe4d7feb3f81103ade3ea6b0d0177639
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 10076 bytes
SHA-256: 0e5288a1472837006c0227e860c841867d8eb1a615523202d0c3b1ba0075df00
font_02_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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