Malicious PDF — malware analysis report

Static analysis result for SHA-256 bae15d808032303b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 08:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 285e87429b344826839fe99baddbbf99 SHA-1: 2f00c0e1be492294e1a1c0d27e9057a360f4accc SHA-256: bae15d808032303bc21643512ee36f477b30620dac65a9dfd0454084e6f696ad
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this PDF is part of a campaign to distribute malicious files or conduct phishing by presenting a large number of links on disposable hosting. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=movierulz+naa+peru+surya+movie PDF link annotation
    • http://icoenergia.com/userfiles/files/76799511120.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/35977613325.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/vuwataviduxomajuxudimon.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/vamidevidized.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/madudamuxejowo.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/80572487275.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/28982116373.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/zovamak.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/47202094952.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/kanal.pdfIn PDF document text
    • http://bjjiffy.com/upload/56116649768.pdfIn PDF document text
    • http://tzsunup.com/upload/ruwox.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/182101114.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/12382034934.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/xutikefenurigugavuzelana.pdfIn PDF document text
    • http://floramarble.com/uploads/figuvetuf.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/30133407452.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43a8eafbc---51780022078.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/kalajetobafeseboxatira.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/47160528702.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/zanaxijekipa.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/15281704627.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8d425b0af1694e638d3b8260269cfc15/83063599704.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/48339018060.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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 10648 bytes
SHA-256: 5e40a2f87aa63b2c265d269d82989e051d46fe25f3d96fac6e2fd324d4a4ec83
font_01_sfnt_off0000f8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B3 19328 bytes
SHA-256: f5d471b3af180879e7dd6226b131ccd8b8397d89f3a3b3f4df9904d0f7bd1d75
font_02_sfnt_off00012aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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