Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ecdd0fc234370a…

MALICIOUS

PDF

194.1 KB Created: 2021-10-06 13:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 322145cec3b6e6402cfd8576d0c591af SHA-1: a781f889754e219a12655b05876aa3bb18b6f786 SHA-256: 19ecdd0fc234370a2860fae4ffb11a51ae02bf02fee84350f616af7dd6bee0dc
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URIs and is structured as a link farm, suggesting it is designed to redirect users to potentially harmful content or download further malware. The presence of embedded JavaScript further supports its malicious nature, likely used to facilitate the download or execution of a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8559

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 http://altus.pl/userfiles/file/33726515384.pdf In PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/64091717853.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/88683600150.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/11282103125.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/24475233651.pdfIn PDF document text
    • https://zzhqhi.com/d/files/favazeroweteponetorix.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/22942597833.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/11327044372.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1613f52f5beaa2---20099744599.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109201323133023.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/sevok.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/nikagat.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/fuxijojimisepakubo.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/putuzimokezet.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/janopatibep.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/jikukekegogizemawusukune.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210918055555.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/51679768434.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/fexulamuxemilogosomeve.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/50206678651.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/8701429361.pdfIn PDF document text
    • https://tsolisp.com/files/file/faxegumavipazove.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/13344656802.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161506c6debe85---19700001164.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/zodobuminoxizejetunazi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=data+structures+in+c+pdf+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DB03 10800 bytes
SHA-256: 6a3fd46dcf83e1d67909ffb6afe16cb00811f42155ebbdd4c71cfa879656dfe4
font_01_sfnt_off0002f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F41D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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