Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b833b02825e72b1…

MALICIOUS

PDF

71.5 KB Created: 2021-09-23 06:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aaf417db5d228e08881ddcb7fae3bbd8 SHA-1: 5aa000eb0825176487fb4e5fd705a70ce3ad0f6c SHA-256: 8b833b02825e72b132b2d25d53e0e1bece77b9e089785061be2847feff429a8d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. The document contains a large number of external links, many pointing to disposable domains and employing UTM parameters, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the overall structure indicate an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 https://coretry.ru/uplcv?utm_term=download+human+fall+flat+for+android PDF link annotation
    • https://reviewz.eu/app/webroot/files/userfiles/files/jifofiligebati.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/11194859214.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/beperurajevinodawuzuxone.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/padodawezegunigulav.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/76677914336.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c115756f1---55734638907.pdfIn PDF document text
    • https://questyme.com/userfiles/file/82573590915.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/11427098686.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/93472844928.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/41806844556.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/85865245354.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/kawavazezajagixidodi.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/9999155323.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/nigibofezi.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/6945691830.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/daraxujodezuzowit.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/jejuv.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/borefiniwoxapumefi.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/67797597829.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613619d212e2a---goxalizuraxitil.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/dawuwaj.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/6302284371.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/vasumidom.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/7398828982.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///runumasepawu.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/14605778569.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_off0000b6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D2 16108 bytes
SHA-256: be7a2b8eb549343da03a35b250ba24e2e055209f80443969c7758bfd4c8f2cda
font_01_sfnt_off0000e038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE038 10508 bytes
SHA-256: 2145949da7722064ef594e765c21bab7f93b4a0b9a0dc25416cf919d2ae6abd7
font_02_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1