Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a21ff7e2e32ce1…

MALICIOUS

PDF

62.4 KB Created: 2021-09-16 06:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2306c6179f21f2a08c6cf9e448c6fced SHA-1: 7fd284452b8df96094b9600e9dd62f7ac7956c6c SHA-256: b5a21ff7e2e32ce1005ad0fdfbb57d9d4f14c2e3def0e7a98688ebe1036ccba9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on various domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination through a network of disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9122

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://polletnv.be/uploads/files/49985055301.pdf In PDF document text
    • https://mar3ol.com/Files/files/16606598278.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/21452976768.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ieilksrim7j5it30p6i9fon949/junoseziraxuwelazad.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/fewavonuvunegovikuwijuxe.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/wisupirojivosewa.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/90885315323.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/76471516804.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/pokoda.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/juwexeluvebumupudufolili.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/ragekasibulawejewuz.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/30746974592.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/nolozililuzud.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/zuwok.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109051721085642.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/wazoru.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090109592473499.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/nubefawikuwikazisaxatewo.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/15117196184.pdfIn PDF document text
    • https://birudongker.com/contents/files/81929130655.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/musokugago.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/4e9c2c21c772bc96204b4f02f1bbce82/nuvogakoreduwuw.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/vujufulikenefasoduvi.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/mawopemesemuwolenanexed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=website+keyword+densityPDF 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_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 10456 bytes
SHA-256: 44908e5a7b0e634c700ea7981fea72cd88481e8b09996d151a7e470505deb31e