Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6d08d7d3bccfae…

MALICIOUS

PDF

79.9 KB Created: 2021-10-08 00:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0ec397e3732fb22ffe45bffeb6e51788 SHA-1: 363a752b5eb0f2061fe85df8dd77ce623b5e1a9f SHA-256: 7c6d08d7d3bccfaebaf3a1a7fab1dc5fa2ea1c36a5270a61bb181acc5fa8b07e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also exhibits characteristics of a link farm, with a high number of external URIs pointing to potentially disposable domains, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/xifulapekenibeluvitivubew.pdf In PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/zumutin.pdfIn PDF document text
    • https://extractos.assaludips.com/Proyectos_PHP/gestor/images/file/36188736945.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/5795333875.pdfIn PDF document text
    • http://hybsch.it/upload/file/gideraxokolifosewe.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210926131308_m9xsjv.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/wepaxalob.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/5383816873.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/xopovidevezibebina.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/23291636805.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/lenipofogifinez.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/vilarojosowivadodod.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/tewobovidomeviwekajafuf.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/19216538653.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/84694680630.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1615f629ea82dd---jusezokutiduserenemojok.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/42935674029.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/46801459570.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/72647054482.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/53326580047.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/benozibovifomekej.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/zovefewemimo.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/52094116526.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/bugezo.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/jonoritanorogamuweza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=dmv+test+free+questions+and+answersPDF 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_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 10868 bytes
SHA-256: 1f0fc47d3189f742b7edf4b5f2134a218d4b09f3b4c9fe4c0773e02a2c023393
font_02_sfnt_off0001023d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023D 18564 bytes
SHA-256: 5908dc40d1dd81d30ce21c6b0782ad8b2dc8aa18777ea8355fae749aaa816631