Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c30939a9109cc8…

MALICIOUS

PDF

96.8 KB Created: 2021-10-21 18:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7272b3bc7ef4a98fa69599dd54d65441 SHA-1: 1e04b4abea33755ac5300f8848c817b7d869d2cb SHA-256: 67c30939a9109cc811c6a39e516ccff2db017dd6e3dc2e5c036a77e63379bc58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of numerous embedded URIs, many on disposable hosting, suggests a link farm designed to redirect users to potentially malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose but reinforcing the likelihood of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=growing+asclepias+from+seed PDF link annotation
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/nitotowitedobufibijufaro.pdfIn PDF document text
    • http://i-dron.cz/data/file/52835437536.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/tewufeguvude.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210928_20BD4D6897AAA3FB.pdfIn PDF document text
    • https://31app.com/userfiles/file/66014566365.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/vegofitoripoxalawoj.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/94019602393.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/57057352366.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/gulefetapurotadidoxu.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/74179905573.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/89973372638.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/50490697780.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/5np7dvuh06bcfgjh240h4jc2j5/76816196652.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/pavefux.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/boviposef.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1615bc698ce10c---lunilonebarezepudiwogo.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/gawajemerogujeparunobuna.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/fejategi.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/55688387653.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/26/file/puxuguvasepit.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_off000113c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 18672 bytes
SHA-256: c2e6f7a4efa504866cb1b339a1320529ce8fc6b47ee929ddc34bc300da199822
font_01_sfnt_off00014474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14474 10992 bytes
SHA-256: 77a77de5fda5da7585579681ccfcb73beed08efcd5d1e63ef3d7cb999c72fca1
font_02_sfnt_off00015dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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