Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5eb247afa9fa358…

MALICIOUS

PDF

72.9 KB Created: 2021-10-01 16:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4afa0a70f96602814a16c426ae71163f SHA-1: 9e4a9b6de551b5879f36532bb65db32745eab115 SHA-256: b5eb247afa9fa358bbe014be427bfb8f4f1415a4145fac99975779a87efaaed8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a likely attempt to redirect users to malicious content. The presence of external URIs and the overall structure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=ada+ehi+lyrics PDF link annotation
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/23260444465.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/83894392304.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/zumafifelete.pdfIn PDF document text
    • http://infoguard.ru/content/file/35441953848.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f3b3da33cd32e88181b74a4e16115a5e/74988706538.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/favisunuba.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/pozevaz.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/71007909621.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/43834653886.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/denukul.pdfIn PDF document text
    • https://badoza.net/userfiles/file/vatawekedupavijifusoxu.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/xelizolatoxelaveju.pdfIn PDF document text
    • http://chinalabware.ru/d/files/xegozaroleritunavafabew.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/34038384389.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/89785780212.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/72993954817.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/57836857011.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0b47f767---nebopatafoxife.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/74843092561.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/vawesaw.pdfIn PDF document text
    • https://thermaltrailrace.com/imagini_ws/lipujava.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/86877166588.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/98140922025.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/48501945138.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_off0000b728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB728 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3F 10240 bytes
SHA-256: c7d61f19e45b304158d5344170fc6064d93cf146c56374e1a7e1dffea7a548c7
font_02_sfnt_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 18864 bytes
SHA-256: a570f320d43097d57db3de0596122660ecfc544e2bb655fa2932226f1c43796f

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