Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1536eaa477ac66…

MALICIOUS

PDF

71.2 KB Created: 2021-09-16 00:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ad5c66ebd6a0cec9759106ff7f00b2b SHA-1: 0e994a9fc10a3433bcbdab36c13635c7def7c02a SHA-256: 5e1536eaa477ac6600735781a99ff67bc92092fc35efad94cc0489358c044e06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are part of link farms on disposable hosting, suggesting a phishing or redirection scheme. The 'wkhtmltopdf' metadata and the presence of multiple external URIs indicate the document's primary purpose is to direct users to malicious websites, likely for credential harvesting or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

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://oniceh.ru/uplcv?utm_term=a+quiet+place+free+movie+download PDF link annotation
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/vovizigatoravenisu.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/kufopuwezeroledip.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/71673565481.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210912210925.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/40411506838.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/tifivalefazepavexi.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/70951868076.pdfIn PDF document text
    • http://doktor-ara.com/userfiles/files/27703823440.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db7ec7fdce---13205484922.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614141dbbc3c7---velulafuravijalezafedufo.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/55486727598.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wovid.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/39630710389.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/54125432973.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/90645237067.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/40190687221.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/gosuvimomojutagugu.pdfIn PDF document text
    • http://hybsch.it/upload/file/22525611842.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/77933640849.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/37094648171.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/gamisomaxep.pdfIn PDF document text
    • https://aromamarketing.md/img/files/mizeralunabonewafoko.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/84815623717.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_off0000b3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF7 10992 bytes
SHA-256: 99a6eba2f75613340da753cb2ca4fb5065a6d96031a47c38e0c26421de5e48cf
font_02_sfnt_off0000e54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54F 16368 bytes
SHA-256: 79779d8eb2a900602931d0a34fa0d7f5c48c0e8e9dccf6515365042a985e80f9

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