Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bcb04511f5d7de…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 10:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2d35b46c5fda5a034e10580eb2bd327 SHA-1: f475c1d05b15ba1c7f0b4c000adea4a0ca8c24b9 SHA-256: 55bcb04511f5d7de2f3174c03e80efcec4ae3d7e3459ff883b612e3cd27f2482
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 hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=suicide+squad+free+online+streaming PDF link annotation
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/puvoxabidalazexul.pdfIn PDF document text
    • https://salonrewards.ca/images/file/48883523032.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/wararoxikewisi.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/makiposofuwosolofozup.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/fubow.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/86967452806.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/teketefejowuvozere.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/kokopalixikabef.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/kawilisepowonaz.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rftmsth0652mfsh39g7hii1ndd/44639484790.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/15107745854.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/72224352664.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/55607150182.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/nesipajebuj.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/wisunujoxizowidudixowiz.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/24454176302.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/88474327904.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebbc5af7c---15655205726.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/devularepetirewofamizapi.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/66324081115.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/zomegawofajanapapajupemil.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/3952474228.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/54845994717.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613718067aef0---74679458238.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/tiraridagafufo.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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 11140 bytes
SHA-256: ebf95cc5d30d9aef0bae41f640e19328a4bac83462931cc468a1452aa658b1fb
font_01_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 19048 bytes
SHA-256: 53df17bf7f3c5eb5f156ec6a9ed2f49c74607b9b9eddfdd5ece6785c93ba89a1
font_02_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1