Malicious PDF — malware analysis report

Static analysis result for SHA-256 d048c073b3dbc9d4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 00:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df5c2c0a19d7ad2b0230e7e11f1bd330 SHA-1: d7d5d6d079bd0d9ba700d30bfa225ec0ebd459e1 SHA-256: d048c073b3dbc9d47d3e6caa0646ccf45d9a6916419ec600ea05d00ecee0fb67
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains embedded JavaScript and multiple external URIs pointing to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using numerous small PDFs hosted on disposable domains to redirect users, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=another+dimension+mod+apk
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f826d23f---dagorunanex.pdf
    • http://kosmonautika.ee/ckfinder/userfiles/files/5797208209.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/gisijepa.pdf
    • http://goodtraefarm.com/ckupload/files/pikevenifedegosozisa.pdf
    • http://ganteltechnology.com/system/userfiles/file/zojixupawovi.pdf
    • http://kaizenlife.com/ckfinder/userfiles/files/80635844785.pdf
    • http://stroyindustry.com/userfiles/file/17732053863.pdf
    • https://magyar-logyogyasz.hu/fileok/file/55557424424.pdf
    • https://appchecar.com/ckfinder/userfiles/files/45383363518.pdf
    • http://yugreat.com/filespath/files/20210906160305.pdf
    • https://laetitiabernard.fr/images/file/89831715825.pdf
    • https://svingenieria.cl/userfiles/file/17695609475.pdf
    • http://lso-msm.com/userfiles/file/65656406265.pdf
    • https://soenen-pneus.com/upload/file/torud.pdf
    • http://harmonie-avion.fr/actualite/files/80893809448.pdf
    • http://redondoclassicburger.com/uploads/files/bogufaruxabotud.pdf
    • http://ideal-site.ru/userfiles/file/94452644932.pdf
    • http://spokoino.ru/i/upload/files/fadujimeworelikafuladale.pdf
    • http://modaxch.com/userfiles/files/79104076377.pdf
    • https://altstudio.be/app/webroot/uploads/file/81295659615.pdf
    • http://vidol.eu/userfiles/file/dififuxeno.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/35242907178.pdf
    • https://agros.net/uploads/file/43017242046.pdf
    • http://dylogistics.com/userData/board/file/kotaborirevaf.pdf
    • http://kiajihlava.cz/UserFiles/File/levimuwizukinasulu.pdf
    • http://artvideo74.ru/upfiles/files/zaxowamijokowin.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_off0000dae5.bin
a7715b056afd2c6cce354affa11cf5a7e90690a195ff2d49fe17bc504c271652		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 10684 bytes
font_01_sfnt_off0000f343.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 16792 bytes
font_02_sfnt_off00010b55.bin
1d33ce7abf7940cf275e062e148d4bd3c8435bdfd29c24bf3f365975f61e47dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B55 17832 bytes

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