Malicious PDF — malware analysis report

Static analysis result for SHA-256 b364faaf1fe76329…

MALICIOUS

PDF

84.6 KB Created: 2021-09-16 02:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74727c6cef5c1483173fcd1d821d79ed SHA-1: 1cd27933b38554d7176100f953beecc2cceb8466 SHA-256: b364faaf1fe76329168cbe2f04fe2607ba45a5e3139045dcc7904e028839b3ed
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=best+racing+game+2021+pc PDF link annotation
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/11766507290.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/fulujibagapataxa.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/84540770541.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/58995060386.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/popegogik.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/mojerifajorepupanovazezu.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/86828357521.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/50540662179.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/33466905915.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/sapunepubu.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/sizejusalatubejoxefewiliv.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/61189891001.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/47410966107.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/livojulijukutaxo.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/temawoxonuwisugajo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613576449ee62---23233385374.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/13605525728.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/35504788561.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/96183597822.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/89888065009.pdfIn PDF document text
    • https://auto826.com/uploads/files/jetik.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00675228f---21222390527.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/sepasofeduwiwegi.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/bofimivul.pdfIn PDF document text
    • https://unosms.us/userfiles/file/3115719497.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_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 10896 bytes
SHA-256: c26fa4227d252d3827e6006f448e1c3a737d30689a1af0d75e0de97571880ed0
font_01_sfnt_off0000fe19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001162b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162B 17952 bytes
SHA-256: c6346776e3630268270df32f2eeeb205983f4b894066582be70c34bb961f8509