Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c0a01b24c88317…

MALICIOUS

PDF

68.7 KB Created: 2021-09-12 07:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98556b600fa2409767cbfd597fbb314a SHA-1: f895d1da09ec60eca85c856d55b7f26658b6378c SHA-256: b2c0a01b24c883179dfb55d201bd4aac2220d831c34204d6c90309a66f23a63d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these external URLs, which in turn serve as a link farm to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=txd+tool+download+free PDF link annotation
    • http://orsini-blasioli.it/userfiles/files/jiwijajetesufutovi.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/dewibulevevad.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/nevawizokim.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/83062204659.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/salav.pdfIn PDF document text
    • http://ned.ru/uploads/files/pusadi.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/wixado.pdfIn PDF document text
    • http://koala-al.com/d/files/1122969466.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/sipanote.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/48179359738.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/41752985249.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/mowewuta.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/kojotexub.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba987dfc34---vegezatoxepixokiloma.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/89297007484.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/gotafogag.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/55883574174.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/20714926094.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/4606716985.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/wodijuxal.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/60293068951.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161395c5ac3fc8---bisarew.pdfIn PDF document text
    • http://tes-sys.com/uploads/ckfinder/files/20210910/16312789464544.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_off0000b116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 14480 bytes
SHA-256: f03a84dbf9d22528ebd82eca48926ddfb04709f172b055952a10d00a357d9b41
font_02_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 10240 bytes
SHA-256: ddf16a9a35e5781578892b49a834a337e319149f96d211aa25bd574acd7583ae

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