Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ef52ec9033284f7…

MALICIOUS

PDF

77.6 KB Created: 2021-10-04 23:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f13c0581d3cb411fdf7b11f3f5abea1f SHA-1: b5ab96e17a3892f6ac0a99eedf38b6cc513d2231 SHA-256: 1ef52ec9033284f7c703f0f93fc65ae46760cc0c94993f93af50fda9bc21db0d
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting. The document body is unreadable, but the overall structure and heuristic firings suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rileyillustration.com/images/agency/files/44143231348.pdf In PDF document text
    • http://architettotamborra.eu/userfiles/files/47343303029.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/19248584197.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/7157528284.pdfIn PDF document text
    • https://cubic.is/userfiles/file/49748676962.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/80301317532.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210906051817.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614b99a466831---budizexiguwaz.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/gitilonimovaverunufikiwow.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/mavigivor.pdfIn PDF document text
    • http://a-pluset.com/userfiles/lefukubedibitomawos.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/xowirezubegel.pdfIn PDF document text
    • http://xn--80aaab5bgii0ck.xn--p1ai/ckfinder/userfiles/files/niwejilemumusala.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/34355456544.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/paduxijusod.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/59176561880.pdfIn PDF document text
    • https://afma.pt/site/upload/file/22310381882.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/67736200110.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/1313680766.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b0da9c59---28309071428.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/29438282585.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/wovidede.pdfIn PDF document text
    • http://exosushi.com/uploads/files/jonokopabatepekupujirem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+level+of+analysis+in+international+relationsPDF 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_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 17944 bytes
SHA-256: 80151500babb4fcef90b303f9ce53497359685feb8be74b0f86cf393e03fd1e2
font_01_sfnt_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 10484 bytes
SHA-256: 2fe3110ff0b72523fd246cb55d80c8b81be586a53e4700a9ab3da53e917be5e3