Malicious PDF — malware analysis report

Static analysis result for SHA-256 4012468918613a5f…

MALICIOUS

PDF

54.6 KB Created: 2021-09-25 11:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4d591df9924d6cb535088f011cb076f SHA-1: 9f11b2ff937d3f5a7c01889a739ea51bcafd8045 SHA-256: 4012468918613a5fae80574b19a9f3af8e08fba45298695639940ae8ef65f724
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to disposable domains, indicating a link farm or phishing attempt. The presence of embedded JavaScript, flagged by heuristics, suggests the potential for malicious actions beyond simple redirection. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7526

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.
  • 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
  • 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://medvor.ru/uplcv?utm_term=vice+city+apk+game PDF link annotation
    • https://bangvetthuong.com/luutru/files/wasalisixixasimufuzu.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/wozusivilavuxorujijasiwa.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/79219925053.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/xogibup.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/minez.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/giridobodab.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/18486657970.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/robavijipijovazivuzexeri.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/mevakowunulazojutupo.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109062317305393.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/zekewikudusot.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/rutategumuxop.pdfIn PDF document text
    • https://redac.ch/upload/9004234190.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/sepusoze.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/fakafarawujifeboginigu.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/42413941612.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/17476191705.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/19267467395.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137459df3e39---56616122280.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/mabulu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16148e14467e35---11353416889.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/girubejuf.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/nudisurosusekelemavu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE94 10352 bytes
SHA-256: dd3484110c84c242901efbdaccaeb7316c3daae108e5057d8e830499fa847973

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