Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b02845a5d186245…

MALICIOUS

PDF

69.8 KB Created: 2021-09-16 14:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1bc8a86be541236a374e106a04bb4a6a SHA-1: 80d5dcd4e6c55a4b24980f42ed401ee66a4cf229 SHA-256: 2b02845a5d1862459fea2324ff9eb65c960feb08576cedea177b36d5b19bf835
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing sites. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://laborke.ru/uplcv?utm_term=pubg+mobile+lite+only+obb+file+download+2020 PDF link annotation
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/gabezepegisesekipebo.pdfIn PDF document text
    • https://endobible.com/userfiles/file/86576015084.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/gepopazevilibiju.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/77812652843.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109160110525891.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136930d7e277---89168438256.pdfIn PDF document text
    • http://chongros.com/userData/board/file/76128548590.pdfIn PDF document text
    • https://tarsiman.ee/files/file/dapejuzalavowufe.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/tagopovozak.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/xafenupozipisotaza.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/81688724124.pdfIn PDF document text
    • https://mkontroll.hu/File/xenejufosuxelenozenusi.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/modaxebavurarim.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/56455126142.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/71026314875.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/42066677856.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/gaxaxujasujumun.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/wozipebuxipetimo.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/36063052714.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/repixesekumudetomijix.pdfIn PDF document text
    • http://ombs.ru/uploads/files/5413574446.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/22612404578.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/baxos.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_off0000b084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 15240 bytes
SHA-256: e86033befe806576c32ac1b392fdf32744aed312e249896040f3709070c6a2bd
font_02_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 11112 bytes
SHA-256: 42cdbc30495455b141766c9beb1c008f77d6a43ec9bd10e7c3f9f2a703a8f053