Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6bc554ad181d52…

MALICIOUS

PDF

79.6 KB Created: 2021-09-11 09:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1454c7cac7321e7cfa7380e07a05152 SHA-1: fa921f4a344bb87d3fe43724fb7bf7794400b439 SHA-256: 0f6bc554ad181d525d81145196a6456463dbdf83d6102729d2bdaa25bec1dede
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://cructi.ru/uplcv?utm_term=building+codes+illustrated+ching+pdf PDF link annotation
    • https://rajakedua.com/contents/files/nizuzuduwarikuneli.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/89039809370.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/sujogifufikunalijoga.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/tajawe.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/kozuse.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/33043550710.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/17351961430.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4b7e5a8cc---62418779253.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/47184529489.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/44278324485.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/14532727620.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/jizuvijugizepi.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/xavinazifegudiza.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/17112671173.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/pekusilaxukumob.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/rexolubolonotirugegowu.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210904_092852.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/25605208851.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613638e2ad75a---nagajirewoninaxegugisivi.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/gawajedavuwovekej.pdfIn PDF document text
    • http://nenorm.com/files/files/gowagufizujelegudazoxu.pdfIn PDF document text
    • 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_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 16856 bytes
SHA-256: cb7e297abb842da9f5730c9cf76046a1372fa03b13898729791ca8ace6a24882
font_02_sfnt_off0001176e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176E 11052 bytes
SHA-256: 07c081995de975253507706fb49c9eae27c0e29f26151efc4764ec834b5a4616

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