Malicious PDF — malware analysis report

Static analysis result for SHA-256 359a425169764d77…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 15:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3247ecd0052db54c41cedb1b1152f1c5 SHA-1: c8e6ee3cd05d65ff07dc748195c37a7544616287 SHA-256: 359a425169764d7777f4e32c16e588816213a7e8caec350513e001110eb0db6a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, with a high ML classifier score and ClamAV detection indicating malicious intent. The presence of embedded JS suggests an attempt to execute code, likely for downloading further payloads or redirecting to phishing sites. The numerous external links, many pointing to potentially disposable domains, reinforce the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613441323fb55---bukazalapewonegoxurofijom.pdf In PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/xofajug.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/sobixe.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/94773116415.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/gelimawubusekazase.pdfIn PDF document text
    • http://hydrem.ru/images/file/16926229024.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebd0e012bf---46565899985.pdfIn PDF document text
    • https://cargotavio.ru/files/file/rawimufu.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/18565221319.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/genonaxalonetur.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/91398667527.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/bogikonugefesuxatexonu.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/63199742548.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/mujukunifemuvun.pdfIn PDF document text
    • http://erimti.com/userfiles/file/jesokoxexakopafurevogu.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/79037181759.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/44994621220.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/72647779233.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/simoroxinazufinonawo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f333ad504b---fufafuferuriwurujoguxedun.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/metuxunebapileboz.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/7526974240.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/68833355626.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/bizovegububadi.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/62305936134.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=first+name+second+namePDF 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_off0000dfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 10464 bytes
SHA-256: 9d97b3b761f75f57e9fbf5222036805e20efafee378825183b62a834c8b55f82
font_01_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 17600 bytes
SHA-256: 996ec82dc3ea1e329ca82e313545082508a7d6e4a31276cad12605dd9a5fbb15