Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50153c8728cc122…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 04:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d6f4692a3b395e24e6a5a8f3cbd0e317 SHA-1: 57b807ca7437066631881d30f6aa18602fb67377 SHA-256: f50153c8728cc122fdd542ea3979aed124227ef40b6a2128b21f7db0dccdb0de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

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://coretry.ru/uplcv?utm_term=android+rts+games+without+in+app+purchases PDF link annotation
    • http://gulfapex.com/uploads/file/mimivijonezirifelezim.pdfIn PDF document text
    • http://origo.ws/userfiles/file/34490357633.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/pekamuxijuwim.pdfIn PDF document text
    • http://mextro.de/upload/files/zudozunobipudivupidumu.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b1fcdfa30---jafuvexebawobuxanuwax.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/35764569041.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/93878536853.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/nonimazerinugi.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/pakolapujipelunegaxanonin.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/10591441269.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/fakafog.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/55565999342.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/44139836585.pdfIn PDF document text
    • http://rayer.cn/d/files/98636638853.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/netax.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/givivazaxuzuxiriku.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/83078693403.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/xiretawomiluxolapisare.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/12195832802.pdfIn PDF document text
    • https://glozor.com/userfiles/file/fojewavejo.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1630588442.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/17650309135.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/xoxarenabibepukidosog.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161320ae82cc68---69265366534.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_off0000e50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 18416 bytes
SHA-256: 5d04494f3da265becac9a79d171b11756f6c7c1d2c5086c6db8ab2caadb70465
font_02_sfnt_off00012bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBE 11080 bytes
SHA-256: 403da43d63cd40bd931c171220f04a5bf831e4df44578555f035420cf011c42e

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