Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb28c4fe3ac2441…

MALICIOUS

PDF

71.3 KB Created: 2021-09-09 00:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b17f26e4b9a12fdf87ac0c4a2bead2d9 SHA-1: 624767add292e5ef5366e66cef743f637b2d56c6 SHA-256: 3eb28c4fe3ac2441820421fb905639f013e31301b4286f111f195c443686759f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute code or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URIs suggest a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queensparkview.com/image/upload/File/wukupetadaki.pdf In PDF document text
    • http://ooexperience.be/assets/Image/files/xonutafugevas.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/10839486071.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/165f8f877645ccc2d5fcb98f2e40da5d/gibikato.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/11019795056.pdfIn PDF document text
    • http://aven.su/userfiles/file/girusigaturimerifujeru.pdfIn PDF document text
    • http://hunting.kg/userfiles/file/80109456183.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/35758905596.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lakasuviluw.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/18017298033.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210903134347400.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210905_091303.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/gerotofev.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/wozeseregixuzutut.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/fizalizi.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130823938d68---22517256118.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/73643821446.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/fovage.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/wezinafunobomofetofi.pdfIn PDF document text
    • http://haai.org/upload/file/zawikuved.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/fifeveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=tx6+android+tv+box+firmwarePDF 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_off0000b47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47C 10828 bytes
SHA-256: 1821776a21dddbc0669663944b3a62f97d03bf6bf92d6fa451eee54515bc17e0
font_01_sfnt_off0000cd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD98 16548 bytes
SHA-256: 8f6972fd7d20798245d04b44d78abb88e9900bb8223c64ce1b5735da935bf0c7
font_02_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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