Malicious PDF — malware analysis report

Static analysis result for SHA-256 301528bd5a2b5d24…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 03:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ea2f2c567422381a2a0bb6b6e4e177d1 SHA-1: 26d9c1a287c828afaef19c88e71fc4bc72eb426d SHA-256: 301528bd5a2b5d2425957025becba17681e9a4f7d301592cb35900a6ffb5269b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://nomylo.ru/uplcv?utm_term=top+10+apps+for+hacking+games PDF link annotation
    • http://etalentlink.com/uploadfile/file///2021090517021634.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/radipizagufoxabiretufowal.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/javupakerijol.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/woxujuf.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/wovitilojabofarek.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/paxufijafoxo.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/52566109597.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/bebibupolava.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/44356374590.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210902205424.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/naferop.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/98932560144.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/wososikejadal.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/ludosaxarikixuzarav.pdfIn PDF document text
    • http://origo.ws/userfiles/file/170518736.pdfIn PDF document text
    • https://produse-zilan.ro/files/29925861862.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210907_142201.pdfIn PDF document text
    • http://innersolutions-uk.com/file/67880669952.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/61139307509.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/71762516494.pdfIn PDF document text
    • 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_off0000df77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF77 17728 bytes
SHA-256: 0336cd11871c4f917c35d7d620477296a38ecd7adba1bbd2883f38cb3426da27
font_01_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 11012 bytes
SHA-256: 8b83f0c9b626013cfb44ddc92a75a502ef075c66b99497ce8d1e5d1328acf658

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