Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72fbf35d90398ab…

MALICIOUS

PDF

77.5 KB Created: 2021-09-23 02:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bfc16a03f3efca53388ae41c4f68bcf SHA-1: b0b989d3ddfab81c636979f4278531bd9bf30ba6 SHA-256: c72fbf35d90398ab13dfc156f954a6ebcdc7136c65ac04151f9d3f766665c5fc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting 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 exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=disable+earphone+mic+android
    • https://shieldtech.cz/ckfinder/userfiles/files/bujuki.pdf
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/tubiporuwi.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/tiforusosuwazijutakow.pdf
    • https://bulendengin.com/upload/ckfinder/files/77814595641.pdf
    • https://winstar-tools.com/UserFiles/editor/file/foridipogibakujuzamenuvav.pdf
    • http://hiace-yoshikawa.com/js/upload/files/gafesinigurazazafewosi.pdf
    • https://tapuionoticias.com/ckfinder/files/jixoratixigazifeko.pdf
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/noguga.pdf
    • http://polletnv.be/uploads/files/bevevidig.pdf
    • http://luluscafeonline.com/uploads/files/16397434533.pdf
    • http://hotelamadeustorino.com/userfiles/files/32411445038.pdf
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/gegib.pdf
    • http://greenbelt.abwingsmd.com/uploads/files/22818373056.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614504032f727---medulajobisegas.pdf
    • http://kdwatch.net/upload/files/2021092021162037.pdf
    • https://halkum.rs/files/29497130122.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86252eafb---33797821037.pdf
    • https://perfecthospitals.com/ckfinder/userfiles/files/pawojikofokezi.pdf
    • https://lnpro.in/ckfinder/userfiles/files/baranu.pdf
    • http://grandviewgroupresort.com/upload/files/vadenosetepemunavas.pdf
    • https://dmshospital.com/mm_engg/files/xerarawebomokukub.pdf
    • http://vssteel1999.com/ckeditor/userfiles/files/beneninafo.pdf
    • http://aedjtjdshbf.pretty-match.com/upload/files/sopigegovipizatusoluda.pdf
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/43038812414.pdf
    • http://fsgzb.com/upfolder/e/files/20210913211036.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb60.bin
9ba7982da96caaf5f2d47bd4b2d045d0e508d716137285b629a09dd3007ee30a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB60 10820 bytes
font_01_sfnt_off0000e3d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 16792 bytes
font_02_sfnt_off0000fbe8.bin
7c3e0c8f1dc6d22d8bec48d935335bf684fb3aeaf2bb55e0e70153e31008211e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 17308 bytes

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