Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e21158a1dedfe59…

MALICIOUS

PDF

64.0 KB Created: 2021-09-16 00:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 165896493fa52d24d4a75b2a6e28a17d SHA-1: 5f8419c0c69d3c25af02e62500c4b5b3eab87e1e SHA-256: 5e21158a1dedfe5945df34abc7b8d628628bfc39e4d67d390fb98b7b5b839f25
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, which are likely intended to redirect users to malicious websites for further exploitation. The ML_NYX_PDF_MALICIOUS and ClamAV detections confirm the malicious nature of the file, classifying it as a phishing trojan. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7964

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://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375cb27f823---pemupunerinazag.pdf In PDF document text
    • https://rotitelor.com/contents/files/60695965550.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/lakopuwuge.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109090831387181.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/soregebada.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/xubezavejugisatodivevoliw.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/99216842318.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/071420222765.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/52823950117.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/divodixejonerifum.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/29650927673.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/67740693892.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/pixuzadexedujelojopi.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/danuzasakikoseluxuzeweb.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/9797190987.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/13640298348.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161361304ee039---51303905386.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/dukokojatoxopusivesope.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/gulasoliw.pdfIn PDF document text
    • https://andrejc.si/files/file/pewufig.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/80084092855.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/14539447464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=vavoo+box+apkPDF 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_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 17260 bytes
SHA-256: 821552f786f01e05a225c399cf3912929f4c079848bd90e557827c36a8e0e039

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