Malicious PDF — malware analysis report

Static analysis result for SHA-256 8968d6b797fa4568…

MALICIOUS

PDF

76.2 KB Created: 2021-11-13 05:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 509c8d68755f3d6df730665c71d2bea5 SHA-1: 1247d3f8aa1bd5a29b1db49e4855823a1fd3000a SHA-256: 8968d6b797fa456881e49e7ee4a63c2522688658013ba3d9ba87dba70ae8ed1c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pasaru.com/upload/files/30952195751.pdf In PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/9b969b055c7d8def1260093eecd43552/numunekofulixeriduzedi.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/45536255861.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/56179513242.pdfIn PDF document text
    • http://ponozky.gultio.cz/webpagebuilder/ckfinder/userfiles/files/bosituwepafewazuwupobuwup.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/86675868814.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/gozopojuzijur.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/libajuforuniradonufal.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/10/file/202110272129546637.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/33987813136.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/72020053765.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/39021101463.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/45932425609.pdfIn PDF document text
    • http://minhquoc.vn/uploads/userfiles/file/rakaratorojirokuxuzaba.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/40115629680.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/vanofo.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/92785416687.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1616296e0d2fd8---dowitowezus.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/wikum.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/13379615932.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/KGDyd8lM0uI/uplcv?utm_term=cod+ww2+zombies+easter+egg+guidePDF 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_off0000c7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D4 16956 bytes
SHA-256: 7522119bb69f70be01cd999b9628c66e34ae25aeee45395906ad283fa901d959
font_01_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 10980 bytes
SHA-256: 79f6a986c41e607ddc0a93007bb7e7111452adb761a037bfe1254abf36986049
font_02_sfnt_off00010c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9A 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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