Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cacc2f8acff5dd…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 17:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ec2d95303e9c027bf0eae02924cbd8fa SHA-1: c4b390209604ec5f4a4150057dea941151fd1fbd SHA-256: b1cacc2f8acff5dd1302dc816f0b562c0b2249330c177f38519137e5ac578028
94 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, suggesting the PDF is used to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3517

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.bash.cl/media/file/82336342165.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/954fbadd4069de35d55e14f0c5608a4e/tutom.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/47871066282.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ceb4e4a35acd700e4f44440ef808b956/guzoremu.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/53413637704.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/vukabigatoseta.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/maxugixudepibibu.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/gidonesozaziwusud.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/15494284528.pdfIn PDF document text
    • https://tele-video.ru/upload/files/mesodalutizarug.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/pojakidixupip.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/789713406.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/23845024398.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/54742483112.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/94453360563.pdfIn PDF document text
    • http://mcutech.net/files/ranitofesosuve.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021092412450173499.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/jajorudikusamefepidavun.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/64867450460.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/77838047708.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/timemegogojekemekoxazodex.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/71536006660.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/10128766532.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/16600915198.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/guzepazixerub.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/wonudowilureropupugogotig.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/54312360336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=derivative+of+log+e+base+xPDF 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_off0000b703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF15 19720 bytes
SHA-256: f56f7cfac4a8d6c980aea188b3f609a98e4f83653ce9d1ba2a79b5b11d7c9e91

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