Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa02c0ece85f7a6…

MALICIOUS

PDF

102.7 KB Created: 2021-09-14 21:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebd286036927aa4da4f3a98ce2764746 SHA-1: 2f2548249fa9430c954200f2bd2402b66c63470c SHA-256: 0aa02c0ece85f7a6283ab7aff55302bb70ef7da45e6085809960d167b87d07d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of numerous embedded URLs suggest a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the PDF and the embedded links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://cafehinglung.com/uploads/files/jebudukeludup.pdf
    • http://visusmarble.com/images_upload/files/wipanipodev.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74011862129.pdf
    • http://beautybybelief.com/admin/images/file/gepivizuvuserudu.pdf
    • https://viadagio.be/userfiles/file/13355083504.pdf
    • https://rotterdampools.com/contents/files/27780266355.pdf
    • http://www.bufolari.com/public/immagini/file/zemagurekunu.pdf
    • http://nghieuphong.com/upload/files/bexixekamapato.pdf
    • http://jwconsult2005.com/file_media/file_image/file/4739332379.pdf
    • https://hitpoint.tw/userfiles/file/navevebetitilomevemadeku.pdf
    • http://movediary.com/userfiles/file/46025762603.pdf
    • http://abyss.sk/userfiles/file/davuwovikolupodowo.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/k3ohie40cg4nmdtib8scs0ik99/jefebozozus.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/tujebumomokorux.pdf
    • http://designerhouse.ru/upload/files/41919776165.pdf
    • http://houstontca.org/Content/uploads/files/46793072441.pdf
    • http://unleadedcoffee.cz/soubory/nilixofebitodijuti.pdf
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62688236843.pdf
    • https://rakowka.pl/userfiles/file/zotilizesukubusosison.pdf
    • https://priscar.com/documents/files/jesafenexav.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=discrete+mathematics+multiple+choice+questions+with+answers
    • 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_off00012182.bin
884f282539301f46564d02ac0dedf4e8dde2b9ab1464a3eb31e8288e2c37dab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12182 10972 bytes
font_01_sfnt_off00013ad9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD9 16792 bytes
font_02_sfnt_off000152eb.bin
c0558258ef3c2edb0e5012634ea41a6de4c91734b027d25711646e139a517b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x152EB 21736 bytes

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