Malicious PDF — malware analysis report

Static analysis result for SHA-256 9448fab8a709abd7…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 07:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8de6b7ae4c46ed21858454eabaa5edee SHA-1: 781936edea8681a770ce7fb6be9b1a3484a64e9a SHA-256: 9448fab8a709abd724d1ba79d7c90281557a4b22a5f30c202e6e92536c60dd04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to external sites, likely to facilitate phishing attacks or distribute further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate effort to obscure the true malicious destinations by using a large number of distinct, potentially disposable, hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=how+to+save+youtube+videos+offline+android PDF link annotation
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7e4078a64---tuxapidaf.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-10-2/20211002074750921286.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1ca7a6bf3cb4e74659f91dc1603258ea/6409320288.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/26289583014.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109131423526271.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/polosukotubafilifop.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109230959293003.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/fanorigozibajuxizujufus.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/pebanajizasol.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/45736967401.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/84460903324.pdfIn PDF document text
    • http://eichler-kammerer.de/teletanuwugirinitiwe.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/53843955858.pdfIn PDF document text
    • http://vaynhe.com/upload/files/92628505167.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/46753266259.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/jigofagetetanifapok.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/61132693608.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/81346090437.pdfIn PDF document text
    • http://congtyvima.com/images/Download/74751494731.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/79761034823.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/73483140968.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092614540412.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_off0000b04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC865 10844 bytes
SHA-256: 0d88c7d941ee87288a96588e31891552ceb029122557a4b128041f4aa9de669c
font_02_sfnt_off0000e191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 15160 bytes
SHA-256: c040de84ad49ad73c9fc368a981945976068d823681bfd70f2e14c64d295ac9c

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