Malicious PDF — malware analysis report

Static analysis result for SHA-256 c838f634acee38fd…

MALICIOUS

PDF

85.7 KB Created: 2021-09-22 17:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 059663d8faf9d42345c938dd9cd37bd4 SHA-1: e04f5718bba4b2db43398764820044a688af67e2 SHA-256: c838f634acee38fd699e4d8065754c60c58dca0eab651ac1126cfa32c1edc45c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://neapol-m.ru/usr/file/jekexedoxiluko.pdf In PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/vosewarasilubemipefef.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/56106500190.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/fokapegamakid.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/sobadilojixuxujip.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/83385973287.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161375c8fdac30---jepofitifukawosogubon.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/titarete.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/luzivomupaduvejawuvoleram.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/2d4323f9ba40866a22e17d2be480861c/31532509138.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/makitikiruroj.pdfIn PDF document text
    • https://toocapen.com/files/bevijoxixe.pdfIn PDF document text
    • http://adice-area.com/pictures/files/44316482186.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/1424959813.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/84972058134.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/47855094456.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/80653356122.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/76799670375.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/kifegigi.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/vigimowefusewifatedotu.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/jexukevomobulixezumap.pdfIn PDF document text
    • http://hanleyresources.com/images/seragexegodob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=musik+player+android+gratisPDF 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_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 17684 bytes
SHA-256: 72856e8e5318350a743856e2d234e111b1bd7581d3cdcd6eb3c309c0cc6c02fb
font_01_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13090 10868 bytes
SHA-256: 28aa162ad94d909b605f09e91523d204346b688960d91d60678c0129b0af0e54

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