Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28a8cd133322bc0…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 00:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c23973e0338faaf4f8107ee8aea0b70 SHA-1: 2ba1c5a05ed38fa83dfdddd94eb1cdb1ef398ebf SHA-256: a28a8cd133322bc018a58a6b1336cd3cff04e040ec5aefc236e9db10142293d0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://fzsvybbs.at/userfiles/file/rupeteguwiwosu.pdf In PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/dazevirutesisomew.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/rejapoxekukal.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/zimotali.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/fawexi.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/bawiponimupabulejagofov.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/85918346882.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613bce2a7c686---jasane.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/61688720789.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/89014076270.pdfIn PDF document text
    • http://kammed.com/userfiles/file/70689186929.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c05484be62---72390666393.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/87228369923.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/raguritizavez.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/75685345141.pdfIn PDF document text
    • http://eternaseguros.net/files/files/dijamowekesif.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/33918128787.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/lewegavasejevid.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/fuvuvotefaleletumojani.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/jekesirer.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/160527519645.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/70655149692.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/situsifexuwum.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/11966439887.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+kingdom+of+heaven+streaming+vfPDF 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_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 19428 bytes
SHA-256: 01dc444dc30f1625f0452378b19643a0fbc4581d0ac75c211c07481e3c373555
font_02_sfnt_off0001239b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239B 10876 bytes
SHA-256: 2c39dd536bd2cebd85c4737dcdbc39e7fe1bda8dccd77afd538fc5f74176daa3

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