Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d95488540af99a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 18:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ef7421c08707c87b10a33507b00ce78 SHA-1: f88bc6e93cd27573d890cf50152ba73c609fc461 SHA-256: d3d95488540af99aa2879175179b83822100ca52e2bf27e499e52d374c190ea2
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files hosted on various domains, indicating a link farm or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to distribute links, likely for malicious purposes such as phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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 http://www.greddy.com/admin/common/ckfinder/userfiles/File/54004191451.pdf
    • http://ptktent.ru/userfiles/file/74937090039.pdf
    • http://toanlinh.vn/upload/files/37384875994.pdf
    • http://harmonie-avion.fr/actualite/files/51683180856.pdf
    • https://berbagiangka.com/contents/files/78246201280.pdf
    • https://art-eria.pl/mandarynka/pliki/files/21488719772.pdf
    • http://alexdisinfestazioni.com/userfiles/files/9601413633.pdf
    • http://nataliashishkina.com/userfiles/file/74860477098.pdf
    • http://akicgiyim.com/userfiles/file/59509340815.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd1c0aea6---lavol.pdf
    • http://www.ambatownship.com/ckfinder/userfiles/files/40054189350.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/vetonipafenofiruwo.pdf
    • http://enotecagaribaldi.it/userfiles/files/2764288897.pdf
    • http://bualuang101.com/backoffice/upload/files/bozatajapakitesazofixo.pdf
    • http://avtosfera28.ru/userfiles/file/sisotomosuputejazenivemor.pdf
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/vivaluzaxekojokev.pdf
    • http://ortopediaszombathely.hu/editor_up/burisexovin.pdf
    • http://lexxyin.net/files/fckeditor/file/ketovi.pdf
    • http://gpsputhuppally.com/userfiles/file/nopavuvivopolivibubixi.pdf
    • http://zdrowejaja.com/Upload/file/tajixadefuvoxafari.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3100258c0cd9057fbfd675f1b122b803/zubos.pdf
    • http://www.centralperdana.com/file/49566820200.pdf
    • https://aromamarketing.md/img/files/lebarukix.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/janenujejozineg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+face+shape+for+bangs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 16792 bytes
font_01_sfnt_off0000f2aa.bin
1f86a9823a9ae6a9b987359e9996df7d9681c2008719dfb6e8f9cd23077ee818		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 10816 bytes
font_02_sfnt_off00010b5e.bin
d49ed8a79cf11155e40faaa33f632c9dded7b898ebbefbd1975aaf56ee7e3f1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5E 17660 bytes

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