Malicious PDF — malware analysis report

Static analysis result for SHA-256 de65056364c2ba2e…

MALICIOUS

PDF

84.9 KB Created: 2021-09-14 08:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69a22de1e002cb6c56f7036d869c8638 SHA-1: 10eca1f00cdbf44e1ea6ea6bcb474a723b367f49 SHA-256: de65056364c2ba2ef5c521b9445acfb838b3b12fc47207cb8f8cc80cede32d32
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 to redirect users to download further malware or engage in phishing. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mytekas.com/UserFiles/file/bomadivijudexidi.pdf In PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/19905361790.pdfIn PDF document text
    • http://toonesk.com/upload/76570357555.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/99236615832.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/zikujoverejevixifesuru.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/zenixebolamidenam.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c450ae11d---25793979406.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/90966970283.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/35310043019.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/magizerigejit.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/movasuzuduvukerulo.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/88147590732.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/karazubuvelanemux.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/13211828618.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210910014734.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/pokuzigivikibunazaguk.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/rivesujazurejixuniko.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/pubosapesilapomun.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/194a0dffcf467d1c34aa274d89c1291d/82972856397.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/satukelemulodib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=mx+takatak+apk+free+downloadPDF 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_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 10504 bytes
SHA-256: f0312c1081b0bf0f98b8bd7c2e3b22d12c071e663f75e536d7a8c7d14c7b46a0
font_01_sfnt_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 20796 bytes
SHA-256: 4365394a3ebb0acbf670486f6bcf4eba4b028bb584a462fe493137f4ca871a74

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