Malicious PDF — malware analysis report

Static analysis result for SHA-256 64370da65d618b36…

MALICIOUS

PDF

72.0 KB Created: 2021-09-20 18:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 13ba28cf234e2cc4d6fb0e22aa4ce49d SHA-1: 84b95b31fe36ddce93ac59958f0a285e2b7c0068 SHA-256: 64370da65d618b361cfdf2033fbff8a4a31a67d4d3411f91b27f371c7c8b4db3
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary purpose is to host a large number of links, likely for SEO manipulation or to direct users to malicious sites. The ML classifier strongly flags this PDF as malicious, supporting the assessment of its attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://benmoonpharma.com/userfiles/file/zizewib.pdf In PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/residagasukegolobute.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd46dd9b6c---14144166264.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/tetarepusogibixasol.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/povapuvegudavumujite.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rifofat.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/24045891749.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/pisilujifusis.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/26833079191.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/gimukawuleta.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/femofosipijo.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/panokegiba.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/34980248090.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/90370631087.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vowodivoverep.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/27317240652.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/revurodexovakisev.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd99d14fb---69972432142.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/57088381159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+custom+seekbar+libraryPDF 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_off0000b405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB405 17644 bytes
SHA-256: 574ae72b72f22757ffdd764f66a0d4c2d1009b41ef5259ece2d41a78f8693471
font_01_sfnt_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 10956 bytes
SHA-256: 948c85bbead59f73128409e130fa39af4e9040203aada580edb9b835fdb27807
font_02_sfnt_off0000fb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.