Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d39adb802d9527…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 17:15:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9ba21f6899356fb5a0c4a724d063cd2 SHA-1: 7f97c880edc1cc8c1d5216029b766a94488966d5 SHA-256: 20d39adb802d952742e2fb1fc15a24046bec75e4b0ae8e88ce2bffea5d27110a
94 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on various domains, suggesting a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further indicates that the PDF is structured as a link farm on disposable hosting, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

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 https://portalkucharski.pl/app/webroot/media/files/rugapen.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613beec6e6fa5---miwesisipewirovokukuvom.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/3260897310.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/20255164704.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/romevozimaduw.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/83389507450.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135d81fe5052---kojawabamovisulolowur.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/dotemikoxoxilowen.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/51432599525.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/20202189722.pdfIn PDF document text
    • http://video-cycling.de/files/file/93165612096.pdfIn PDF document text
    • http://gerocuki.hu/user/file/mijomogorevadurasuxi.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/ragavagegojevuz.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63440048927.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/kafoxanosilim.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109180508241100.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/zurugepijurekuxeg.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/rikosozenameselufeza.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/tukujeluvefibonimeze.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/15646994622.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/posit.pdfIn PDF document text
    • http://zerosquareonline.com/file/dokezugiwazaxoposomonoga.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/48552418359.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/16371943191.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/99884532247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=screen+recorder+with+internal+audio+appPDF 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_off0000db4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4F 10704 bytes
SHA-256: 78c79792693140a51442bea91fe27598bf9c05c108d3f5282b1c94b837dca8bc
font_01_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 17120 bytes
SHA-256: e7ca49e23cefa22155de9db95f03e4bf2c2c5c4e9a6ab86b2119c03795865ab3

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