Malicious PDF — malware analysis report

Static analysis result for SHA-256 259d5f4d9dc4022e…

MALICIOUS

PDF

86.6 KB Created: 2021-10-10 14:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9b58ed94be61a2653f7cd45ab6ac5cf4 SHA-1: 78a298aba96e045af2da96a8d6ea28fd75ed27a1 SHA-256: 259d5f4d9dc4022e9b789432cce6f570e243480967aebfcd6191728172a51f4c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to redirect the user to external sites, as evidenced by the numerous external URIs found, some of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • 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://llbyggodesign.se/UserFiles/files/26023827014.pdf In PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/19340596570.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/55535931182.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/45551848480.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/kikivuwemojosasifofinef.pdfIn PDF document text
    • https://btegypt.com/file/49242269092.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/bojibalorexonofake.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/wuruzafadidivekaza.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/gifujelekebuzujereleg.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/lagaraxabe.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/pilifive.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/pepijoxa.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1616104d708150---rewekedebamovilum.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/466939335.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/91729716668.pdfIn PDF document text
    • http://mlight.cz/archiv/file/venifikobobitujad.pdfIn PDF document text
    • http://fitviewer.de/files/file/povotulepubafo.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58545858337.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/kuguzodajovidufavipid.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/vilutabilofut.pdfIn PDF document text
    • http://asfalon.com/__files/file/gibakixofumo.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/24234764478.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/gujorevavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=out+of+spite+definitionPDF 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_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 10308 bytes
SHA-256: f948ebe914e9bff3ef996a1a14f8103fc00947f8d5b13f484a630f8f1c1da65b
font_02_sfnt_off00011976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11976 20172 bytes
SHA-256: 3c9e90988912d29ca92aaedfa46f02f54d6655f80d09d59bbebb35b4096894ed

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