Malicious PDF — malware analysis report

Static analysis result for SHA-256 64bd5974af643826…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 13:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67b4a96e81dc88bfb40c002c594abf0c SHA-1: c91f0eb94c251fa79e31037fcffeb990cb374c93 SHA-256: 64bd5974af64382671e3db95514b27b4da2388f356900152018c86b752a699f2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=games+to+play+on+the+phone+for+free PDF link annotation
    • http://test-immo.com/file/kasopazebebolipefos.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/kafuwiguvekevipaxoliw.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/puvifodimifopig.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/21764796601.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/wugexexinarofu.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630920693.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/58838543109.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/82533385514.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/febofe.pdfIn PDF document text
    • https://orangerun.re/photo/files/kerawigedipewu.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/xekuminivamotuxas.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/66307058313.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/57d7bdc60f25b22d690f537864728932/neripotixodipu.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613058ae0ee75---kitotuwi.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/42859260470.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/39934399973.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/58846272115.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/regiruxusewanafixox.pdfIn PDF document text
    • https://invest.pl/userfiles/file/59780717371.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/bozikipefox.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/90591167062.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/darukubujagapof.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/20884175562.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/92878849677.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_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 10684 bytes
SHA-256: a5016d5417ed486f4eb2d3f897b4c2ad949a7668b4047a24395da13ad2acd1b2
font_01_sfnt_off0000f815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 18164 bytes
SHA-256: daa6c06b362a6b9d0e7b71a4e5a70b43fd5620f5f0ca31cffb5e08d142f0072c