Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de07124e9f65ad6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-12 20:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be521a8a44331dddf2cb3b4b56555a4b SHA-1: 44d14424a6b4fe475a235c316e034def2770513b SHA-256: 3de07124e9f65ad64c5729cc4ba22568db73546f6d82fd2e06dd496f072fb2f7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://lawtutors.co.uk/js/ckfinder/userfiles/files/sexano.pdf In PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/09/07/saxukajop.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/dumuxurexuvedovovobivuz.pdfIn PDF document text
    • http://evola.it/userfiles/files/95532255634.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/96174494073.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/kosoledexulonuviter.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/xuxulimevepajosikabumu.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/gokalef.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccd0070ca9---kixitolil.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/92083493138.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/78364658691.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/xipedored.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/nobagulexewogatow.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/19373294188.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/85291385354.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/vamej.pdfIn PDF document text
    • http://remobudostol.pl/pliki/fenepeza.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/86690047336.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/giridesewedusipunurivaroz.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/97091898667.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/83922572983.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/minidugo.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/kizimobovusadudew.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/92903249052.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/doxukaxubuja.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///zofiganizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=wear+os+browserPDF 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_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 18076 bytes
SHA-256: 63b299b1ec774e2b8e9ab22dec5ded4ac16d259e6d948395b69d7c9c1bfd0f5f
font_01_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B35 9980 bytes
SHA-256: 67d8686d3413f492d75e0d651bcf269952dfb5e6ce807b5df26ce41ee60e5409