Malicious PDF — malware analysis report

Static analysis result for SHA-256 792ed2df85b0732f…

MALICIOUS

PDF

75.1 KB Created: 2021-09-09 19:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c024b4e23bfc0267fcd39b44c6e28839 SHA-1: fb4b187c175a7a2a9652e962549f572a4b67446d SHA-256: 792ed2df85b0732fcaa1d81a2fe03a6bb56660c2f39b8e9a5e45dce799f414ba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs pointing to potentially malicious or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of many unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://buydecor.ru/uploads/files/73099409473.pdf In PDF document text
    • http://frigotechreina.com/userfiles/files/68314930269.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/6646650465.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fddf41274---defilikenezinisotitot.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/xepuwumagifetotitajuse.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/67511041456.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/vuwamigapaxituj.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132046fdc5da---keligesutu.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/gidak.pdfIn PDF document text
    • http://lecostationery.com/files/file/kiximatorovugetixepis.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/vosokakagi.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/jesadenujiriju.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/93712053924.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/doromewewubepar.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/fedijagujukebosudedat.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/fuzuragenavoxafid.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/44546688834.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/5015222155.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/61840951422.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/7162510513.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/25603051057.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/perebinejeg.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/wobeluzizifupirejul.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/34648274889.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/tewoxazexikofol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=grob%27s+basic+electronics+pdfPDF 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_off0000c021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC021 17256 bytes
SHA-256: 3c8d317b315b0606f9bcb53e8258f834b7bf4cc3164c096c9008deaa2845cd58
font_01_sfnt_off0000ed30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 10828 bytes
SHA-256: 556d184e4d9de17d34189ca1f7596aa3c4aadfdffde7ee13a0516a2806d0297c