Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c3bb90e421ee5e…

MALICIOUS

PDF

96.9 KB Created: 2021-09-14 09:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e0a79e4af7d9ab1a8560be7910783e8 SHA-1: d453165c33bc169738f0dad71ab5effbbd36ee34 SHA-256: 74c3bb90e421ee5eb0b742ff6f2e46e4650a2af30d3050f4255b909c0c27945d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to lead users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.e-oswiata.olesnica.pl/ckfinder/userfiles/files/taropijapuk.pdf In PDF document text
    • http://cycling-software.com/files/file/50026092912.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/zutadopitovisawejogituli.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161383cb2e436a---45061474988.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/tagejixejoj.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/74339552462.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/26074110404.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/fipidefebaderuzezi.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/loxuriwumediwuzu.pdfIn PDF document text
    • https://izr.fr/files/bowekovemuginitofinabo.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87689083411.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/89378803196.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/81495637459.pdfIn PDF document text
    • https://datajournonepal.org/files/rajabimixo.pdfIn PDF document text
    • https://slotpt2.com/contents/files/denogirude.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/jogazogipeki.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/rodomumifituwufutafame.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///31879325949.pdfIn PDF document text
    • http://czyxchem.com/upload/files/79645146532.pdfIn PDF document text
    • https://ptogel2.com/contents/files/73264900913.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/58265577734.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/21158749168.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/18021572039.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/98649182022.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/xolixamalajezunofomofapuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=moonlight+sonata+3rd+movement+piano+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11103 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001291a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 11176 bytes
SHA-256: 569247ec9cd031cf85c68920331a4523f52b645609bdd66587c2d59e436e6856
font_02_sfnt_off000142e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E3 19300 bytes
SHA-256: 2cac6af65203c53e728555fb7535f153553f9a9c2c0c9972adb3b3d2fb5a5491