Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b98841a459d528…

MALICIOUS

PDF

62.7 KB Created: 2021-03-02 13:10:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e375026dd2965fd94552f62c371bebdd SHA-1: df172529c9ad0a47d46de3bab381ea10b7be0ce9 SHA-256: 91b98841a459d528a7a2ec2109c783e4d9131df74368a844c8f8647fe35785b6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The presence of a critical heuristic firing for PDF_SEO_LINK_FARM and ClamAV detection as Pdf.Phishing.Trojan suggests malicious intent. The document body, though heavily obfuscated, appears to be related to educational content, which is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9668

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/award?keyword=balancing+chemical+equations+practice+problems+worksheet+with+answers+for+class+7 PDF link annotation
    • http://nunedosigiruros.22web.org/86484526140.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/zabuluk-zutex.pdfIn PDF document text
    • http://big-ita.space/15991579448tasxu.pdfIn PDF document text
    • https://zelopira.weebly.com/uploads/1/3/5/9/135990333/gagobitovozusavulo.pdfIn PDF document text
    • http://pirewarekow.mywebcommunity.org/how_to_shrink_powerpoint_file_size.pdfIn PDF document text
    • http://wagirozi.iblogger.org/kickboxer_hollywood_movie.pdfIn PDF document text
    • https://bokakuvuzojoji.weebly.com/uploads/1/3/4/3/134351808/xolavoxubured-satigidaxot-vujikota-dusevax.pdfIn PDF document text
    • https://lakerevuko.weebly.com/uploads/1/3/4/6/134654656/9495850.pdfIn PDF document text
    • http://lodorobirat.22web.org/9072694239.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/xamotexatudesemiborumopev.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/como_restaurar_backup_iphone_para_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/befibupudemesobalizi.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/7175367099.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/microsoft_flight_simulator_2019_xbox_360.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/luwufalamaroluwibiwomitin.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/nojafoxikukofivafoxapu.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/31927012103.pdfIn PDF document text

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