Malicious PDF — malware analysis report

Static analysis result for SHA-256 2148a2b15cff5a26…

MALICIOUS

PDF

74.1 KB Created: 2021-09-21 00:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f08c249dd0a0c89d1b8622d5b32127f1 SHA-1: 75b478413d2b41d5e612b4ef5b3c4d086590e5a2 SHA-256: 2148a2b15cff5a26c8700ee9eca7514727e77ea6f11a7d3a9269c422741663ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to host a collection of links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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://combatkuntao.com/ckeditor/ckfinder/userfiles/files/92661240774.pdf In PDF document text
    • http://duet-czluchow.pl/userfiles/file/79199679921.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/karalibunebotaraw.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/61160492886.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/dusixamomosot.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408f4d7eb26---dikilunemodololud.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/nekebimofuvip.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/wodizo.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58430573447.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/vovemepopetudupafut.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/xasizexopan.pdfIn PDF document text
    • http://ternovykh.ru/content/file/fimupapewolu.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/lofazaganewiv.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/52347698334.pdfIn PDF document text
    • http://danbikoreansj.com/uploads/files/66503851135.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/79520799771.pdfIn PDF document text
    • http://holzbau-napetschnig.at/3810575550.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/fejawosabibiniz.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/pimanomowugon.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/tasiximatirader.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/r3luo302ff8ob7sce5kc0ke7so/22469356988.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109032156524454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=find+the+arc+length+of+the+graphPDF 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_off0000bc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD418 10708 bytes
SHA-256: 8b982d4b4bf251ecb0b2a9881062284a35b594b94b40f4ed6598a4f4c7b9b3b0
font_02_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 17888 bytes
SHA-256: 85bff3c0353a2293c32d900693193349ee5df46fbc11c36c4dfdc742fb00d406

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