Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bae2f2fbafa9518…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 12:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 666692623f5ea4b32adf6df1c225f9b5 SHA-1: 9ee16ee2350a75dff5c92c0d3c576ee554917d10 SHA-256: 0bae2f2fbafa95187ddf01ee55abfdb3117d92f4f49015830c7694f4c9350be4
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5559

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://cructi.ru/uplcv?utm_term=digital+signal+processing+in+modern+communication+systems+pdf PDF link annotation
    • https://cebubigsellers.com/userfiles/file/daleromexuwiferurozapewox.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/34780632905.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0ef746ff48b7b4b23b4f49bb8e8f3eba/suxon.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/mogelutiwuwulesugunawo.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/tudajugagudozamokiwijilo.pdfIn PDF document text
    • http://tchid.net/userfiles/file/nogixukuroja.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210904111603506.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/1491694471.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/zekexuwusosunakebukazakal.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/76545965724.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/99978692434.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/giwusumilune.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/revamitaziveza.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/788805696.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/17541371755.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/6132943944.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/xuxalikilip.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/77374579445.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-10/20210910163230393920.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/melakunaxejijedis.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/14071483962.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/77029507200.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/89357803876.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210911020017.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_off00012992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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