Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffb88ce34f6d25c…

MALICIOUS

PDF

63.7 KB Created: 2021-09-19 13:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fedd539790adbd06b0c87b0a960d5a95 SHA-1: fd6894660c9a0db351e5bc5fb5652c63d8432114 SHA-256: bffb88ce34f6d25c4844e48101b0f335ce6924c374b9d9e6ece92987d21463ea
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external domains, and one heuristic specifically identifies it as a link farm on disposable hosting. The PDF structure and embedded content suggest an attempt to redirect users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7986

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://chcial.ru/uplcv?utm_term=android+phone+jokes PDF link annotation
    • https://at1-turbo-j3t.com/contents/files/80908767382.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/23180392517.pdfIn PDF document text
    • http://www.moyekolodin.com/files/jomiveli.pdfIn PDF document text
    • https://granitnet.hu/editor_up/14466216621.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/10460940259.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/lepesakeb.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/84530345289.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/gafagoporu.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/rofus.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/fuvopubemuxadesegomud.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64823223712.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/55799368638.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/kezafetedudelopaliga.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/lidedemunet.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/17082990516.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/vumufefarigixurijotenap.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/gisijutafemavi.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/medenifiragusaripo.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210915164225.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xunipabapiratubumofo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/tepse4qifttgi3a3b6hn6jva7d/lawum.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/27063931244.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/genutafuw.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/23398338839.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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