Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff60095c10069d4a…

MALICIOUS

PDF

76.7 KB Created: 2021-09-10 04:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: dd66414fa3a8e78dad1b68290aabd7bd SHA-1: 22cdc6a2efbebd703ae3f0e2948da8429c2f118a SHA-256: ff60095c10069d4a71e9eb6825e5342c145b697597e9e739256cc278d0318a4b
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 0.9963

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=this+is+us+season+5+123 PDF link annotation
    • http://comlark.ru/userfiles/files/4812308737.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/zexuto.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/67314152544.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/81945281026.pdfIn PDF document text
    • https://ms01bet.net/contents/files/kegowupu.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/nufefuta.pdfIn PDF document text
    • http://mosjob.ru/images/file/lebikezofo.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/ridobifubevajove.pdfIn PDF document text
    • https://norservis.cz/files/files/16055010321.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/42764396080.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/lowun.pdfIn PDF document text
    • http://zenkatsu.dk/files/39634230206.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/90341500599.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/vojezowamivupol.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/sifubefosozigij.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/38908425256.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/10811207740.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/76782603515.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/366210938.pdfIn PDF document text
    • http://hotechike.com/files/files/23929613485.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/xuronekegugipogum.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/bazemafomobanuxuvor.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_off0000c80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE023 10500 bytes
SHA-256: 789f8981beec7cf188f0f555a13d3d77cbfad816d3b1b8023e7581da8a172815
font_02_sfnt_off0000f812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF812 17860 bytes
SHA-256: 1768172113d305f1ebf46e28b351f28fc5a35836483bfbac689af1ffc13e5a46

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