Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2739655e72a926…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 20:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 405898f54c479b413a1152b44426329e SHA-1: 38cc09feb394f01777b607b03bc6560c9a6f8323 SHA-256: 0b2739655e72a9261a0ad91f27ed043e7878948dc1c1c00c38a2e3a383656aee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are hosted on disposable or suspicious-looking domains, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support a malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=pikachu+pokemon+mystery+dungeon PDF link annotation
    • https://securincasso-online.nl/ckfinder/userfiles/files/79177332705.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/84405454906.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/bamojamugudemaf.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109160757162298.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/22099822524.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/19749953189.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/87249172603.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/fifelinidexubogut.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/bomeladagufitazufedab.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/10889629582.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/20667648801.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/lerugosibonixazejaka.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/82480760815.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/zamizil.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/jebanenoral.pdfIn PDF document text
    • http://tochalco.com/uploads/files/sexazefagetowixupali.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148954e12b9f---vadapomujujamuv.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/95547221849.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/fesemilore.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68812996092.pdfIn PDF document text
    • http://sql110.com/pic/88001005039.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161443a2ebe2a9---86921750673.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/pakojurex.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/95122862547.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_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 19276 bytes
SHA-256: 4092d061760fcfe0cd3174cba950a6cca06667793202699c9d7dcb201ce5185c
font_01_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12368 11224 bytes
SHA-256: 7787cf5394271c8a352b144d0ba1b41b1f275d7adf2f64fafd2899712ae29705