Malicious PDF — malware analysis report

Static analysis result for SHA-256 79dd3509d6c4b868…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 16:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 16a275e513765f7f510172c3c90ad249 SHA-1: 2a956d8404f2b17d24480f99bfed9bc792402f23 SHA-256: 79dd3509d6c4b868bcfe380f5d223f029d0e072bbb18ff29c6a22b6898cb094b
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 maliciousness. It contains numerous embedded URLs that point to disposable hosting and appear to function as a link farm, with one URL specifically mentioning 'lulubox app free fire hack'. This suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=lulubox+app+free+fire+hack PDF link annotation
    • https://livres-d-art.com/ckfinder/userfiles/files/zenuvevulevosifimideli.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/lusatunorena.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/33820845778.pdfIn PDF document text
    • http://candientushinko.com/images/file/kawozuvaf.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/50269115913.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/64078039952.pdfIn PDF document text
    • http://erpos.sk/data/files/21048281815.pdfIn PDF document text
    • https://samowar.ch/upload/file/bavisuvidox.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021090400120773499.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/dezofeka.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630835763.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210909_6A03DBB6AD0A9AC5.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/63695604551.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/vevelojupuxefeb.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/pezinolimegoka.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/zibozina.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/vejilulimagew.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/jevupafuwo.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/82474743860.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613364b88a304---dinozujeraxitulesi.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/5271476024.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/28831540817.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/15120275162.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/65640784955.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_off0000d443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 10596 bytes
SHA-256: 939082f1056fb10518193a697a3ea90ac57e65c823007f38082f7030c2c6e607
font_01_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 17236 bytes
SHA-256: c9c64c749769e3877dfd022ac724000cf09d85f6871dc46b9ce772c30ea41b4d
font_02_sfnt_off000118a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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