Malicious PDF — malware analysis report

Static analysis result for SHA-256 418d8f82904d56e6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 10:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af2f86e82dd0dda09401314568bdc118 SHA-1: b9a79ec3fc9bc17565714a6170020202c2d6d175 SHA-256: 418d8f82904d56e694275d4cc4288c749cd4e3ac35491a9e35485e7f84e268cb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to unknown domains, and is flagged by heuristics as a link farm and potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous links suggest it's designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://matkinhantai.com/luutru/files/fomutagojofeduborixur.pdf
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/sagute.pdf
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/wuwuzoke.pdf
    • https://parfumzone.ro/files/file/pemifavajafalikagok.pdf
    • https://riondene.ch/img/uploads/file/26800212538.pdf
    • http://pathtojanna.com/userfiles/files/munifutunebalimojepanuwe.pdf
    • http://xn--oy2b9bv81anouola.com/upload/file/202109072210513959.pdf
    • http://vikohasanfiber.com/upload/files/vijozubed.pdf
    • http://obraz-tlt.ru/userfiles/file/zosijegulewa.pdf
    • http://www.thaitofu.com/image/upload/File/marugofafotinolitoge.pdf
    • http://www.zywawiara.pl/pliki/1740388376.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/17240328704.pdf
    • http://mirai-kankyo.com/userfiles/files/vixamukegelarajepelinevi.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/22636936866.pdf
    • http://ddservice-bmw.pl/userfiles/file/95870017936.pdf
    • https://bkairconditioner.cloud4demo.com/uploads/files/32450265952.pdf
    • http://innospectrum.eu/hirlevel/file/72041074122.pdf
    • https://glycocalyx.nl/userfiles/image/file/47652895974.pdf
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11085753404.pdf
    • http://aolisenjiancai.com/data/files/xizulesodozitalizaxedabi.pdf
    • http://elskup.pl/images/assets/file/rogidufimituriva.pdf
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/44680445293.pdf
    • http://geomanteia.com/userfiles/files/27192326950.pdf
    • http://lscapital.it/images/file/gubiledepek.pdf
    • http://styrexon.cz/userfiles/file/14639444435.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613719661e784---78709968494.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=best+firestick+app+for+tv+shows
    • 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_off0000df8d.bin
bd7fea4c7d661f0ce2a18595c9af05f6680a98a5eaa6361067bf78adcdfe2841		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8D 10724 bytes
font_01_sfnt_off0000f878.bin
e2e1c3356688c656a2cd461d4ba711466963a224c794b185a0cbeb8fa2a6f9dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 17656 bytes
font_02_sfnt_off000125f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125F7 16792 bytes

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