Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cf887ab0b8b73e…

MALICIOUS

PDF

69.3 KB Created: 2021-10-02 11:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3502c6283f67ba484fcdd9fe248511c2 SHA-1: 43d9f4ccbb1e6902b4c3a3be23fc4644d552527f SHA-256: 91cf887ab0b8b73effeb4953a5e6fcc6f1a50e57d23531c10e1408dac4767f75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a link farm or a lure to phishing or malware distribution sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://chcial.ru/uplcv?utm_term=put+up+your+dukes PDF link annotation
    • http://www.hebrewforreadingcomprehension.com/content/60881966257.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/biwep.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/vebadofizagiwuzex.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/gatezafagepenifikebesa.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/sowodubezivi.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/99566735033.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/90917348415.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/sojifomopebipiwemuzo.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/64366771061.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/46260451230.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/mewebuzo.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/15757563895.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/52765581171.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/77750362732.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/rinasus.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2bd6cc354---davok.pdfIn PDF document text
    • http://riversedgefm.com/files/file/17379738919.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/kadefizonerefiges.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/47129063567.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/bebebusizidinavakibiliw.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/toxafe.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/28888570864.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_off0000ade0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADE0 10288 bytes
SHA-256: 99942d79bdc2dd01e08e6b727f7212ca5960051185c5b13f0abc752bee4d8e5a
font_01_sfnt_off0000c539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC539 16796 bytes
SHA-256: 1573d2c967645a963c48328c97150fe0bbab0ecb1542c8018c6f6b93c4c6d21f
font_02_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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