Malicious PDF — malware analysis report

Static analysis result for SHA-256 312058b6964e0f9b…

MALICIOUS

PDF

68.8 KB Created: 2021-09-28 22:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 21b57eb7d495596a09e9dab31b4aa5a8 SHA-1: 1515b10700cb68ffdbd4946bb13a78604b8ee2fe SHA-256: 312058b6964e0f9ba4f0c11baaa05d1a2cbeb4022f8220033ba4513cbc9a55b2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as a phishing trojan. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, a common tactic for distributing malicious content or conducting phishing campaigns. While no scripts were directly extracted, the structure and heuristics suggest the PDF is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7d8cc8170---kumujedutezimugelu.pdf In PDF document text
    • http://maility.pl/_ADRESuserfiles/file/pevekupinisip.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/42520151691.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/72492703582.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/53950847507.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/27270434651.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/dotinatitapu.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/89108381888.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/nezuwimuninasewof.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/xevonukesijadepanezuxe.pdfIn PDF document text
    • http://boki.hu/editor_up/zunetejogedim.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5b23d9cd8cf5162aa971f46792b8475a/rutejipi.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/gunarilujagol.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210915164719.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109091449141580.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/nefeveredebawedowe.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/nuzasabiwiwine.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/99121780331.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/roxelesirupenilok.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/niziraxibaze.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/kumubedamorixaxititofulov.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/nijesubunovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=watch+a+quiet+place+2+online+nowPDF 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_off0000af16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF16 14632 bytes
SHA-256: c66033fdc5295eb3a8827963cb8dcc1f18c62b841e3264b3dc6ebf1350143d15
font_01_sfnt_off0000d36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36E 10648 bytes
SHA-256: 12c944ae1134c561eb8690e8fc7c66700110e99988a18cbd77005db8a7757696
font_02_sfnt_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1