Malicious PDF — malware analysis report

Static analysis result for SHA-256 9801b8d5350e829c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 21:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ad7e2d452fc1ab3b4640817abf8dcc0b SHA-1: 844f24aea59c88e0d640948deddbdd54abbf312a SHA-256: 9801b8d5350e829c46c5ae8b709c09d9f20a778a87d29bf11f3461faeee85e1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which are hosted on disposable domains or are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://medvor.ru/uplcv?utm_term=material+ui+kotlin PDF link annotation
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d58901b6e---69411842816.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/68826955935.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/51039328789.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/21448972775.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/11364045067.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/xapobep.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/99434191820.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/58121493305.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/raduwepezuwimaxosu.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/xanorosadoji.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/serojuvibedusapasebiw.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/46310635566.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/doxepitafesufazowafijeta.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/51246985915.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/24340634753.pdfIn PDF document text
    • http://tchid.net/userfiles/file/97549641271.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/babupam.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090800075056.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/11799474924.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/34839318419.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/finafowijarubuk.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/bafefeded.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/zuxodomosexelal.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fa602b3ca326367b018cbe9101d63293/bawowigeribukuduvonemab.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210911_005156.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/fesim.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/33328616045.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BD 18236 bytes
SHA-256: e4ca735b98c8e880bfa59179aca3a9930ec99343cdb04716bd354cbf080c2ed3
font_01_sfnt_off000105cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE4 10116 bytes
SHA-256: 2adcc432ff978de5e1ad4159bb6c85fe7de61cde96441f5738876e6e1c77277b