Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af47d38d5eb4c9d…

MALICIOUS

PDF

84.4 KB Created: 2021-09-09 17:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b8028811dce370053c8ac771a02e2565 SHA-1: aceb795a5a4052e265f986647699d7303486fc98 SHA-256: 8af47d38d5eb4c9d8a146aea1bf2d539255b374455015f2140778ed8d883626f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users to malicious content or downloads. While no scripts were explicitly extracted, the PDF structure and the high number of suspicious URLs strongly suggest it is designed to facilitate the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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
  • 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://villapellegrino.it/userfiles/files/kikevazojoxelif.pdf
    • https://global-product.org/CKEdit/upload/files/ledoripelikebozut.pdf
    • http://cnsgawefgl.netsociality.com/upload/files/85489182896.pdf
    • http://akvatoria.by/UserFiles/files/lusevafabalinowojavosali.pdf
    • http://infinijewelry.com/userfiles/file/76652804273.pdf
    • https://matrixx.lu/images/42658748914.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139107f2c351---74099747220.pdf
    • https://mobiligennari.com/userfiles/file/90130229872.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/99364178965.pdf
    • https://sssmri.com/ckfinder/userfiles/files/84538722874.pdf
    • http://nanopena.cz/upload/file/zixonubebitamirutunemoma.pdf
    • https://prestinireedcorp.com/userfiles/files/ragalarisokiliji.pdf
    • http://aloeverajuice.cz/files/file/kexafimofonujeloxotovufu.pdf
    • http://kiapelhrimov.cz/UserFiles/File/jawilaf.pdf
    • http://driver-jazda.pl/upload/file/77654185849.pdf
    • https://coonvalleycc.com/userfiles/file/lawowuwasokelivopubezale.pdf
    • https://mrpressconsulting.com/UserFiles/file/lixemixa.pdf
    • http://macautemple.com/userfiles/file/renuwu.pdf
    • http://koppeika.ru/userfiles/file/73105489325.pdf
    • http://mstreatmentadvances.com/userfiles/files/62133581318.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/62602041498.pdf
    • https://luckysurface.itweald.com/uploads/files/6130385f991d2.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=vidmate+version+4.4840
    • 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_off0000d8f7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F7 16792 bytes
font_01_sfnt_off0000f109.bin
49ed720e6287a36ebc402b70171a4edc72bdc801c35d022b829cdaac8bf2e699		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 22624 bytes
font_02_sfnt_off00012b5b.bin
3dbef133d87a650cd63476dbd474463c53c6f18f1e921ec59e28336cbce6e0bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5B 10872 bytes

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