Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79fc232f2636b0b…

MALICIOUS

PDF

69.4 KB Created: 2021-09-28 13:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff6b3a6dfc8e18620d0d329cdbbf8b20 SHA-1: 9cc94b042610eedfd88e4d0669d6a4d8ab75d407 SHA-256: c79fc232f2636b0b7f8f69534b981f321954207c06171b1b5a269624ead832c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous external URLs are embedded within the PDF, suggesting it functions as a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ketchas.ru/uplcv?utm_term=rupaul+drag+race+season+13+online PDF link annotation
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/78616484426.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109161549492383.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109222257111626.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151938e673ff---17726246899.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/xarevix.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/jatax.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mametu.pdfIn PDF document text
    • https://emenu.hu/editor_up/votepagife.pdfIn PDF document text
    • http://plise.org/userfiles/file/16460323246.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///gefig.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/58124517726.pdfIn PDF document text
    • https://isleo.com/i_photos/file/xizepegokitaper.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/xosibuzaraxajolamubigal.pdfIn PDF document text
    • http://healthywithhart.com/res/file/63506700029.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/33025160268.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/netozaridotizapirus.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/1805599784.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/8354115463.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2fdcfec0c6bcd6e424f85f7d25e26840/biperupemulaf.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/67547089956.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/zemisomoli.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/7713639264.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/32354609115.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_off0000b0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CE 14956 bytes
SHA-256: 3b7b3d9c1082fe4ebaeeb597db839983947aef300d2f6fe70592d1a2d36a652d
font_01_sfnt_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 10960 bytes
SHA-256: c7b3a128165e997ba7b31173f8ac800fc4cf02c5b085ac7e056c27058b14c3c9
font_02_sfnt_off0000ef86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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