Malicious PDF — malware analysis report

Static analysis result for SHA-256 94676213bfc89972…

MALICIOUS

PDF

100.6 KB Created: 2021-09-22 10:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ac2e67c584a05c70b418b1825c469d89 SHA-1: 9ee2c0523ddf89c87acc6564ff9635c344504638 SHA-256: 94676213bfc899720cd38c621d20ec2e7385acf3771b8bad46aa6f545392dfe3
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with a critical ClamAV detection and a high ML score indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm designed to redirect users, likely to a phishing site or for malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • 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.
  • 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://fc-junajted.com/upload/datoteke/wipoferap.pdf In PDF document text
    • http://nicolalazzarotto.com/userfiles/files/92875226327.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/digirafag.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/pokiridikidakipi.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/011425022299.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/wixufabilofeviloxutawezi.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/44270944682.pdfIn PDF document text
    • http://patroha.hu/file/46675283133.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/49042788434.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/sekofazodesawexinojatol.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/xupagajar.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ffc51a1ea---mikapusogumiwukumik.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/30903869918.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/57954585549.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091215461062.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/gutivonowiribazo.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109160549108318.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa27e9403---43050396675.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/3423069003.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/bizugavanewubuzupeju.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/15498131003.pdfIn PDF document text
    • http://3sdent.com/upload/files/46226299023.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/72178708393.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/39473087255.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/mareb.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/suxasilivezezumafirosut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+webview+javascript+examplePDF 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_off0001212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13945 11180 bytes
SHA-256: 5b084f29b9ad133ebf8cf75fa71feb187f79a0c96d6ebba35ed1fae710ff5a35
font_02_sfnt_off0001533a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1533A 18708 bytes
SHA-256: 2c1e71a4edc0c084fa4837ec52dbf164f3725be4f6c34a13b220aac7e5b34ff7