Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bb85e23f002897…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 14:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a60faf5c60145cf012b5de968055357 SHA-1: fc34d6ed0e2e857d540e1cbfa61f51751f483140 SHA-256: f7bb85e23f0028974aaeb2085f9e61566a6c7684a5aabc7cd92317d7ed29e7ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The `wkhtmltopdf` authoring application and the presence of embedded URLs indicate a likely attempt to lure users to external sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=go+launcher+premium PDF link annotation
    • http://smingames.com/ckfinder/files/wusinavivokolalusogez.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/finamutuviwimodub.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/061151565188.pdfIn PDF document text
    • http://hun777.hu/_user/file/3092065529.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/73882349924.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/poxekugufigukixa.pdfIn PDF document text
    • http://palami.by/images/file/30698380847.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131fff942a4b---sibukezoxaxizanizaxuwuk.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/lezozezetatikawavoxoketav.pdfIn PDF document text
    • https://mycultureis.com/FileData/ckfinder/files/20210921_295B794604987872.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/6485555269.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/rudabugugitodikonekosoxej.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/berimitekupu.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/lukunamutitigiwug.pdfIn PDF document text
    • https://ahha.az/userfiles/file/88924760838.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090720030594.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f22b1698d20c431637cfbe014d7aa85d/51295445174.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/vifarowusitarulax.pdfIn PDF document text
    • http://enricobarraco.com/files/lupotabodegura.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/70759369021.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/nodoreti.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/10994397831.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_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 10512 bytes
SHA-256: 547a29c79ef70121c4c96cb76aa0e0fbf8d8a5bf342425009a303201080d13d1
font_02_sfnt_off00010430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 17372 bytes
SHA-256: 118c0ef9e24d8d7a21e9d58d5e42afeee434cc00f037e4a8acec2257d73a786b

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