Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb52fc5295f74f12…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 06:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8aaba48a032482c3e645318c67387c5 SHA-1: 37cdbbbe978f476407718b64495d90cd25ea8120 SHA-256: bb52fc5295f74f12259ac294cf6862827abd2cabd13d301177bc6bdf129aa900
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm designed to obscure the true destination. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score indicate malicious intent, likely to trick users into downloading malware. The ClamAV detection further supports this, identifying the file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ekvatorbl.com/userfiles/file/dazami.pdf In PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021091123032073499.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/mezugubukewasivo.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/tukuzebaxiraladija.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/43641134890.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/lizivuxilemumos.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/tegakeg.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/46231050833.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/vogufi.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613707196fa75---96371550709.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/pepagibilim.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/96136245774.pdfIn PDF document text
    • http://arucax.am/user_images/file/somegegakaga.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/21475397452.pdfIn PDF document text
    • https://fuoriscena.eu/file/sizezafoxaf.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/53405218596.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/jobixuruwa.pdfIn PDF document text
    • http://cutskytools.com/d/files/puret.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/5715112662.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/55819128377.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/demerosorexivujarofeda.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/vanorogasenipatipikebok.pdfIn PDF document text
    • http://oodow.cn/upload/file/210905212632432559gmu81cweazr5.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/48511586249.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/60878075184.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/26494723937.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/rumodaxafanego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+firmware+samsung+j5+primePDF link annotation
    • 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_off0000dc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2E 11196 bytes
SHA-256: 01e5ac680f0c63d1fbc02570a038dda1ed8f10cf7b5f019e8e07dca7c0008553
font_01_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 17596 bytes
SHA-256: 78021d96b81e4811bf49a0dfac81479970f2c5903c9a71bb95376873241da2ce