Malicious PDF — malware analysis report

Static analysis result for SHA-256 7908ff1eb8e05634…

MALICIOUS

PDF

92.2 KB Created: 2021-09-13 06:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6842ea61bbc54c85ab9591d8f2ca4b52 SHA-1: bc0f9e77ef962505271c76ee7b35308efae4bc36 SHA-256: 7908ff1eb8e0563485dadf414f3ed91f9b76af5901d670478270f317d5ded1d5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further payloads. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://lex-ter.ru/admin/ckfinder/userfiles/files/vipotu.pdf In PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/42426972294.pdfIn PDF document text
    • https://jensbrode.de/files/file/64001925002.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131f891ba3a5---22532538495.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/vugaranus.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/1512120449.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/ridabagivekijol.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/49012663519.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/28381615774.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/53859922717.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/bafasubizuwane.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/zevod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe0789ce2---kagax.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/60640585877.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/93275151739.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/83575268275.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/97614626239.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/logozasupozosunenerut.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/ralolidumemitizipugixofad.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/95747811441.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/94158284576.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/topazeliw.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/71562058829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=best+daily+diary+app+for+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 17180 bytes
SHA-256: 47260bce1e2e046bcc410ef5c5830bb3f8240cefbe1c4c0ee6ca7e825ec71651
font_01_sfnt_off0001192b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192B 10660 bytes
SHA-256: 7956cc0e24d27480cce1f2c4f1c0e56c976bc6c82ee3528a7c17535cc7e809c0
font_02_sfnt_off000131ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BA 17000 bytes
SHA-256: 9ddd64c857275f6b3802abaa5a5d5ea2d69042b3b9a9781e57bdae5f1b4cf75e
font_03_sfnt_off00014a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1