Malicious PDF — malware analysis report

Static analysis result for SHA-256 358942cbd04b6cac…

MALICIOUS

PDF

71.4 KB Created: 2021-09-24 23:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9800a924b0dc40612924a0a22c4cf73 SHA-1: 6693c43ec1b553e92aa86caeead899c244942df9 SHA-256: 358942cbd04b6cacd75326fbbca1c91f2b98b7b1aa880ec42d3f1fdc56398891
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to facilitate phishing or distribute further malware. The embedded JavaScript suggests an attempt to execute malicious code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crysiq.ru/uplcv?utm_term=conjuring+3+full+movie+in+tamilrockers PDF link annotation
    • http://mutamobilya.com/images_upload/files/tasopumex.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecaabe5ab8---27762709612.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/xufetotojusorufo.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/dokobipunosifala.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109222220252602.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/46635696306.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/dukofulumoxid.pdfIn PDF document text
    • https://deepex.hu/hirek/files/84653045426.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/76340003416.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161403e9c9c1c0---wugatigaxomowute.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/somewunijujitanab.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/55606536580.pdfIn PDF document text
    • https://123natura.com/stockages/files/dotaf.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/22641955337.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/zafuwomapebilebiselixun.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/73626574623.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/gixixomaremopesolofogo.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/61541066348.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/28520823709.pdfIn PDF document text
    • https://goodline.by/userfiles/file/85070230889.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/55423123515.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_off0000b132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 17096 bytes
SHA-256: f3779379e31f8fcff80fb8d41d12a688df6c3ff2977908fa53dd5547fb776725
font_02_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 11268 bytes
SHA-256: de98d05af89c27c0e7f68e3d192ac48db1616e699d969423dca07144c9328db0

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