Malicious PDF — malware analysis report

Static analysis result for SHA-256 c713747c8bf198b7…

MALICIOUS

PDF

77.0 KB Created: 2021-09-11 22:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: df216a6741c1969902ebff261745ccdf SHA-1: f3c583a997a972ac6298719bc19fa4532b05795a SHA-256: c713747c8bf198b77d7ac496acf34af0da575decaca1594dd0d7caaf380c5d4c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=android+transparent+status+bar PDF link annotation
    • http://splogservice.ru/content/file/tibarizijirukak.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/28984668070.pdfIn PDF document text
    • http://sissonne.hu/editor_up/63238127782.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/pujodinajonudavujidur.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/19279852547.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/39935184688.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/venav.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/mixegi.pdfIn PDF document text
    • http://kmsenior.org/file/files/75487868404.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/16094128300.pdfIn PDF document text
    • http://receptlap.hu/files/togatozutujaxazo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee177816e5---16417303916.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/somapekeli.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-7/20210907010747115797.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/76112274314.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/66924841831.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/07032652647.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/32018758793.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7da6ca89---bufejiwazinapozij.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/36474636499.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/wowatibumaf.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/54518117316.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/17820208505.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/voropusofu.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_off0000c59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59D 10560 bytes
SHA-256: 5a72e6f07d70375c40434bfa46be5c621766047c4a742259ae5a8df0a8eb1fe5
font_01_sfnt_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 18408 bytes
SHA-256: 7e5af79fd51f407710bf8c710a79e4765c983f45551625025f110687abb909b0

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