Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11440b59b793503…

MALICIOUS

PDF

76.2 KB Created: 2021-10-07 03:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 7692921ee1bdfbbcc4b27914e637364c SHA-1: e51c04429b15e1e46b6cd82a4779d0bb3e10e85c SHA-256: d11440b59b7935035433f361f0df5f960f2b11c7ba656f8562344f65c6efd88a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on a variety of domains, many of which appear to be disposable or low-reputation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://youngthisyear.com/ckfinder/userfiles/files/79222772205.pdf In PDF document text
    • http://paolacaone.eu/userfiles/files/21835586398.pdfIn PDF document text
    • https://trystsalonri.com/images/file/95387513476.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5fc3163b02ec6cad2bae2a1abc8a96ae/jixegodadaxibote.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/dififiwew.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20211003_021726.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/jiganupulilibipexonama.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/7009302412.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16153c8dd68625---sematiragawunus.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/57105013249.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/67091465735.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/nekoworejuzaganosuvake.pdfIn PDF document text
    • https://jobtiara.com/files/files/nowawugavovef.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/44319202545.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/47768940420.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/kazovurimosakelij.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/demetotorepov.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/46614923267.pdfIn PDF document text
    • http://crediramasrl.it/public/file/16148009911.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/73731822680.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/vegibegepuguvej.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/44324347493.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/30673563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=class+6+history+chapter+1+questions+and+answers+pdfPDF 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_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 18712 bytes
SHA-256: 0bd8dd771032f1403bcfb0db443fdc9cc911fb0b543d10c5302cdee8fd50c18f
font_01_sfnt_off00010b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3F 11412 bytes
SHA-256: fe3d5b98143745a921e856233fab5ef3162c4ce029c54291f06eda0763cb1c46

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