Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2ae51cf71a5f6b…

MALICIOUS

PDF

74.7 KB Created: 2021-09-11 23:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 00d88790330968850e46b1b7cc0d79f9 SHA-1: c30a13aef0e7533c58d67ffebebd5ac7a33af466 SHA-256: af2ae51cf71a5f6bd84f31295324926a59fa491b3580130d185c7c12a654f2e1
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. ClamAV detection and an ML classifier also flagged the file as malicious. The primary attack pattern appears to be redirecting users through a series of links, likely to a phishing site or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7568

Heuristics 4

  • 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
  • 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://rockpapersun.com/upload_mce_image/file/pugabidenoxi.pdf In PDF document text
    • http://fantasymusic.it/userfiles/files/pobova.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/16756904938.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be499c8e5b---kosizixigolujibazidovox.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/28796531011.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/6135acfba95d7.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/gaxukexedonudoronolurabur.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/14462637516.pdfIn PDF document text
    • http://myesen.life/userfiles/file/65532868652.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/78370450420.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/37166064412.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/bisivodubebejosibi.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/lutebotewediwovakudogepi.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5686de8d5a2b4291018a2c6ff4011717/3439491652.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/nufipinapegatorale.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/78820728732.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/42468617193.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/rowomas.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/80646664280.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/72921159201.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/fapunamegoxavudarori.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sebiwotafi.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/55385064549.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/zewipatasivojusajuzav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+gym+exercises+app+androidPDF link annotation
    • 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_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 17852 bytes
SHA-256: 3818aebbcec0ce234db0d983cec2acd7cf2fd7fd86686ecbd1a25f18a4ee056e

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