Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cdc99d8f9141a0…

MALICIOUS

PDF

62.3 KB Created: 2021-09-21 03:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 96d220ce0ddbdfda43816077604255d6 SHA-1: fd29217964ab61487c02aaedfcb9b501964ec708 SHA-256: a5cdc99d8f9141a09a37e02efa56d75e1e602b442d503680f7d37398f89ddd23
124 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files, many hosted on domains that appear to be part of a link farm. This suggests a multi-stage attack where the initial PDF serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

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://sictombbi.fr/ckfinder/userfiles/files/22012191211.pdf In PDF document text
    • http://philboyd.com/91838499819.pdfIn PDF document text
    • http://ecole.ru/text/images/file/kuketuxipifigatijazanosiz.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2b0e78b89---sajevamumemalekavofob.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/46688290699.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/seziwowigudujisaso.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/67177606560.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/12593566357.pdfIn PDF document text
    • https://educhina.mn/editor/files/25422354680.pdfIn PDF document text
    • http://channelletterguide.com/ckfinder/userfiles/files/sizenalinidedozeseluzup.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/46675773705.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/zipitej.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/tojumagivutaponikepevuz.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/xafubexiteromagixun.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16304587702100.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zonolaz.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/dupiripiligizilemi.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/zawitatajexose.pdfIn PDF document text
    • http://minerva-collection.net/files/files/34635124974.pdfIn PDF document text
    • https://network-italia.it/file/19349928713.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/kivibogedagisogoba.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/baroxaganegusunekogamo.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614902a6cbc84---87431742993.pdfIn PDF document text
    • https://aedwea.com/upload/foto/37473337857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=mupen64plus+apk+downloadPDF 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_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 10612 bytes
SHA-256: cef9d9b0d0b09a20fac428307878f492eeb1b7f2369e916562a1451f08788797

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