Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d664a0feb51ce35…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 13:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 864620a4fe05dcb382f4aa1518adaf84 SHA-1: 84fe9495e3aaf74d785c99d7e855899956d152e8 SHA-256: 7d664a0feb51ce352e83a47640913a9de38f24284055d7e5f7d05688c98be070
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are 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 0.9985

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://huntic.ru/uplcv?utm_term=psp+emulator+android+games PDF link annotation
    • http://upakuika.com/img/file/mukajone.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/77155629615.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/86998013716.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/29960430649.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/66526525593.pdfIn PDF document text
    • http://pololanna.com/user_img/files/gelopowamujuzexanakof.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/rifajekesuramupefaro.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/kojusutumosevu.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/rufuvilazok.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9899d3351---danitamovuriluxer.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/kediz.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/33317015574.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/4090526133.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/ganajironepukinedokule.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/noxujofaxawotezoli.pdfIn PDF document text
    • http://art-ball.net/files/file/kikubejuzuvapexe.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/45272013498.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210914010234.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/99590407e8c38c9989967b95a631d88a/gedolega.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/zuvigivobu.pdfIn PDF document text
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/tanoxuduzatenononatute.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_off0000dd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 16796 bytes
SHA-256: c30f71ff3007879c71c25e6099bf91a390b79ab5bee4ea3312ee93a04c9e979f
font_02_sfnt_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 10836 bytes
SHA-256: e76252e6bb9ba36a1596287a366bee1d14c0887711ee20f6c90c7a8a38eedb05

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