Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9e42076a084a00…

MALICIOUS

PDF

77.6 KB Created: 2021-09-14 11:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8cc9cb11a883d9f530fc9d9fc0b6c41c SHA-1: e9f145f34bf47c294c47dc8268110a9a4cb3db3a SHA-256: 4f9e42076a084a005a3af076b54455df071938721ff3572bd4c9a06bb5f2c201
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to potentially disposable domains, suggesting a phishing or link-farming attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a large number of links on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6548

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.
  • 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
  • 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://nucamsa.es/userfiles/files/39819757055.pdf In PDF document text
    • http://hide-bo.com/img/tmp/file/33452850670.pdfIn PDF document text
    • http://banquat.com/userfiles/files/75862107956.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/jarebinezewegemotonuf.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/44142999885.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/sepoja.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/poriked.pdfIn PDF document text
    • https://greenways.at/userfiles/file/jojatezuku.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/wuvijidi.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/difowulew.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/9091343574.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/godimowajadovoxix.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/61400ab5eff17.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/pumanivapijudodagipi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d834a55811---fovixaro.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/71232031164.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/90791746591.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/rejexunewivorinolemor.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/92213680801.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/47220082650.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/bujimabimuzigob.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0ef3f6a9---1041445347.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/tumejulemel.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/14143051510.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/50284619683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=offline+asphalt+gamesPDF 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_off00010ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDC 10608 bytes
SHA-256: ecdad6a13a1d2be267dd44ff44f7896b5be8aca72fb66ff5613374ed871c7500

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