Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bdeedc82c607b6…

MALICIOUS

PDF

72.3 KB Created: 2021-09-13 18:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84475029737d3349cb8e0add4ab41e82 SHA-1: 6e9a70384965026f2938511d3dcf1572d9e112c7 SHA-256: c5bdeedc82c607b641c95830a613d5c2485b1874bbf45cbe626042ba44615e4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to domains associated with link farms and disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The sample's structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://ou-ravda.com/ckfinder/userfiles/files/wanakomupujifidov.pdf In PDF document text
    • https://kokomanis.com/contents/files/simenozaw.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/pubawakulepitepulosaj.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/37322194404.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/59768138808.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/fikixaseb.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/jewiwowosatemalozogonev.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/31684006689.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/buwirexuxikokiwisomofa.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/13267650533.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210903103644_1012466355.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/56743723343.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/54092898481.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/lutepedemimodosinag.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13206533102.pdfIn PDF document text
    • http://tfforming.ru/d/files/47743804796.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2d3d6bf9---mikoxugexevedakejudaz.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/ginasizepibatuf.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/61b7930c521a1e4726151a4a92db326a/rowijovu.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/jikigoxeduwakumov.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/jozolivupenuvipeziwopolo.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/95984177761.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/tozelenemuzob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=super+crime+steel+war+hero+mod+apk+unlimited+moneyPDF 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_off0000b59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAC 16928 bytes
SHA-256: 38d2a44df27bbb0c53f74bf1e2e57220939bdb8fe948bf00959247ee2b07ac94
font_02_sfnt_off0000f965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF965 11244 bytes
SHA-256: 3baa93d8a225f6a2d908d02b14639d1676f8b974a2a5ccb77250dcea0ac8cec5

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