Malicious PDF — malware analysis report

Static analysis result for SHA-256 85547b525b4d0ce6…

MALICIOUS

PDF

72.2 KB Created: 2021-09-30 16:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75b04d4288f2f67467c6ae151c5a2970 SHA-1: 98e79c9803380420e86d0b2fc1be3bbc341137f0 SHA-256: 85547b525b4d0ce61d84ca1c7fae6a42d9be5f8b28c0991226f08df2ee4fc31f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, including one that appears to be a redirector with a 'download wifi hack' UTM term, suggesting a lure for potentially malicious content. The PDF structure itself is also noted as a link farm on disposable hosting, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=download+wifi+hack
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nizirijitododogepusaresi.pdf
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/wuwalufam.pdf
    • http://kiko168.com/UploadFile/file/20210905062744773.pdf
    • https://yourdentist.ro/app/webroot/files/userfiles/files/maled.pdf
    • http://emanuelarombiarchitetto.eu/userfiles/files/mijumoda.pdf
    • https://ipmgrouphr.com/uploads/news_file/98247309857.pdf
    • http://toyotarent.tw/FileData/ckfinder/files/20210930_D19C024180E33EFA.pdf
    • http://kssi.ir/public/userfiles/file/jinewuzupajudaweg.pdf
    • http://yas-center.ru/userfiles/file/mozuzegefawijekapolepa.pdf
    • http://ceresasrl.it/userfiles/files/zunamerawitewodufa.pdf
    • http://siamsankyo.com/Uploads/file/32770013190.pdf
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/86877996840.pdf
    • http://viettelhaiphong.me/data/dulieu/files/78860946629.pdf
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/varuwazof.pdf
    • https://milosislandrooms.gr/userfiles/file/93216579800.pdf
    • http://shinies.ru/img/lib/file/povufebovapi.pdf
    • http://amsasecretariat.fr/userfiles/file/kukubebegemepovibije.pdf
    • https://dursunguney.com/userfiles/files/fizisikamezopuzu.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613835314297f---majeveguwen.pdf
    • http://sibmaxi.ru/userfiles/file/vavugata.pdf
    • https://infiniteprospects.com/FCKeditor/file/fakewegejivewoxotozapupa.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139adfd92cfe---82207781997.pdf
    • http://imcborivali.org/userfiles/file/32299417988.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_off0000b7a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A3 16792 bytes
font_01_sfnt_off0000cfb5.bin
4173f53793fce7f46377ecca79778cca8d373aa33d474a029f5f9f494050e46c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB5 17432 bytes
font_02_sfnt_off0000fc4c.bin
d2b07a399b8d6fa2e9dbdc242d81685c39e8cc2fb3f0c11c72f885677a830a0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4C 10256 bytes

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