Malicious PDF — malware analysis report

Static analysis result for SHA-256 2205545e9a002eef…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 08:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77af215e558c2f1d542b984e6fc813b2 SHA-1: a479454b43011d63007f2c4e9202f40500571566 SHA-256: 2205545e9a002eef3153aaadac27c9b9de22223456ae8eff93628b3b521d7145
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights this behavior, suggesting the PDF is used to distribute links to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://crysiq.ru/uplcv?utm_term=how+to+delete+android+os
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/79173760168.pdf
    • http://www.smartusb.info/images/library/File/95177749835.pdf
    • http://iscelenie.info/files/file/tunabosivupovazusekurer.pdf
    • https://citytrafik.nu/images/file/19676544315.pdf
    • https://zaragozadenoche.es/upload/files/18477630947.pdf
    • http://quiltingacademy.info/fckeditor/userfiles/file/33710763204.pdf
    • http://gyermekhaz.hu/Content/site_images/files/45926593307.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624a5e3677---77851238192.pdf
    • http://parbatsamajjapan.com/img/files/files/28209997557.pdf
    • http://fields-on-earth.com/images/blog/file/26854055574.pdf
    • http://tokyo-sanritsu.com/userfiles/file/xibujeraxarozavaza.pdf
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/lotakusosagara.pdf
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/13093619967.pdf
    • https://futurefacesmiami.com/uploads/file/66755172668.pdf
    • https://gangnampools.com/contents/files/66477447031.pdf
    • https://www.alugutader.fr/ckfinder/userfiles/files/foxetugitusotuwebiwe.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614691e46fd22---2004774902.pdf
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/19444747812.pdf
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/22963946943.pdf
    • http://seattledesis.com/fckeditor/file/lixalikeriseku.pdf
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/56430949469.pdf
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/zedawudarosewuf.pdf
    • http://ibnuaffan.com/ckfinder/userfiles/files/fezogawepafuduvidogukugo.pdf
    • http://commandhousecreations.com/uploads/files/23943582172.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 16792 bytes
font_01_sfnt_off0000f593.bin
d6c3938aa21db69d3fdf8699f8eb2fdfe56725e1ea9ea4802b8c732d7a15fa53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 17320 bytes
font_02_sfnt_off0001221f.bin
1c5ddd935d0785bba25cf7991a3ebbcf48fde0d21ab429abeaf6444d822c8c28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 10320 bytes

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