Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6485f8cf8ce5be…

MALICIOUS

PDF

76.1 KB Created: 2021-09-20 11:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c9d7f076b0b1376ccb51a60d768f040f SHA-1: 1b19f45fedb3ced9280fd5c79791a8b5319a0fad SHA-256: da6485f8cf8ce5be7146ba221d48610e9c8f76f6c2f2f9ad068b7c8648ab147c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to exploit vulnerabilities or deliver further payloads. No scripts were extracted, but the presence of multiple external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 http://fzsvybbs.at/userfiles/file/mesivototugubopupirorol.pdf In PDF document text
    • https://siroyensao.com/upload/files/65494298643.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48e39bd1d---migugesuxironoja.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/depobimepavofusuw.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/piwogaguzoduxoji.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jujijaporomofixomuj.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/68917258865.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/tutekinepalofupikeva.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/19575142862.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/31502569041.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109111000472205.pdfIn PDF document text
    • http://flirdining.com/uploads/files/5186260727.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/larikajugenopexil.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/sejubib.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/83737833849.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/32247199584.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03543931f---mexarak.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/89980434510.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/dizuzitusarepuga.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/jetevo.pdfIn PDF document text
    • http://nemalipics.com/muraxikonobo.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/59997636778.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/zubomefalevu.pdfIn PDF document text
    • https://reha.bg/content/upload/file/46715619448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lol+wallpaper+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4A 17728 bytes
SHA-256: 831d47e97acf39544812765b73cab6cac914a2e0d727c6c6f28a6bbbe5577e5a
font_02_sfnt_off00010bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 10268 bytes
SHA-256: 4c0e6b35b86439b1b1d7e1bb700c2560991561b8ca0dd7ad59a472bc1c67d9d0