Malicious PDF — malware analysis report

Static analysis result for SHA-256 c520f7cc352bcb2c…

MALICIOUS

PDF

62.4 KB Created: 2021-09-11 02:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e704a02cda16341f48647730f0dfe9e7 SHA-1: ac376e9ca7e3e73c3f5d14490ddd7c13bc6cb6ea SHA-256: c520f7cc352bcb2c926f5d55553e46111a85a6cbc0f288c6777521d38e90d452
124 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files, suggesting a link farm or distribution mechanism. The PDF SEO Disposable Link Farm heuristic indicates a high volume of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8994

Heuristics 4

  • 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
  • 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://kotypsy.pl/ckfinder/userfiles/files/53595752895.pdf In PDF document text
    • http://rzn-house.ru/upload/file/14429930739.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/lowiros.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/47072001471.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/buzululoxasajelozun.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/xutuwirisir.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5b5f3678b07b1c348fd3bc09703c1100/63185954703.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/29505051995.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/2323219418.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/dilerumurasanapi.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/21187059632.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/2804691765.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/jezijemero.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/zonodutezuxojafesogiselu.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/15003446887.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/73655060393.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/65489044977.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/29862112935.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/32813789486.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613327bfeefd3---72136554053.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/guporawon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=one+s10+launcher+pro+mod+apk+downloadPDF link annotation
    • 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_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 11068 bytes
SHA-256: 2714f7fbd2a2430e021da4e4895fa1156ffe6b6652e0b48f1514c13e78ae70f6

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