Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed220fe075141d6…

MALICIOUS

PDF

72.1 KB Created: 2021-09-17 15:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e3d74f4af29709f753b30c3c406b982d SHA-1: acaf8aebb28bde2253782675f1b93ec2cf5d917b SHA-256: 0ed220fe075141d6a6b558b61607f1a0358530d0d07b6466b65e74ecf4e7ad3a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The document contains numerous embedded URLs, many of which are hosted on disposable domains or are part of a link farm strategy, suggesting an attempt to direct users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the sheer volume of external links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7670

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://catamma.ru/uplcv?utm_term=desktop+pc+wattage+calculator PDF link annotation
    • http://www.iciparis.ru/ckfinder/userfiles/files/xolaxirotunuxezijo.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/524769181.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/nelasinakezamulisareju.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/vanolimojokuwu.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/potubeg.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/tizitaza.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/kozudisalilumadowa.pdfIn PDF document text
    • http://iucecb.com/files/file/99942736812.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/girakuwo.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109021452579497.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/82270427501.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d56f0645---8424364995.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144100768e1e---41041919282.pdfIn PDF document text
    • http://wmsone.com/eimages/file/7800135727.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/lobufotanasudibevemoli.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/kogutu.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/ginixoxeleposarigoxa.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78346181671.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/dudotatobu.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/dozus.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210903_C6AB6F78368530AA.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/jobokegilibede.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_off0000e32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32C 10632 bytes
SHA-256: f15542d9bc25bbb01eaa254b58ca07df88c9ea811078788b40b277dd32d0b221

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