Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbc22eafe289497…

MALICIOUS

PDF

76.6 KB Created: 2021-09-11 06:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 73e4fa67db633831d8ec26341e2075a5 SHA-1: 28cf52991f838f3a98b04aa2aaee920c14251081 SHA-256: edbc22eafe2894974cb909b62b516f7b059c42bb1575c90ea7f5095d30fd7b25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tecnomatec.cl/upload/file/1206210057.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161381f26918d3---72163353739.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/33147588541.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210906195349_p9gyp0.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/tatuxudirolaxefokewedi.pdfIn PDF document text
    • http://mastervin.ru/files/file/gewududetomagiwoserodas.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/fudiwisejofugamejigev.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/96032030789.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/zinovunimopaxiba.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/tavakifaduximibot.pdfIn PDF document text
    • http://langyupharm.com/upload/files/22123065503.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/698bb2c9a948502b5671a61c442463a6/ginawajaberov.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/xudotanujomode.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/81642486602.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210903194321.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/nemiw.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/govokosesuxa.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090113035073499.pdfIn PDF document text
    • http://poorclarescork.ie/images/48646995453.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/11093088917.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/relakukowo.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/54684989387.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/pituzasezodowapiwigu.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210906060845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=japanese+english+dictionary+apkPDF 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_off0000c3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FD 10988 bytes
SHA-256: 5714fac5cb1706d75aff2fedea30e3de5b45867aa44e72e447e282cec4b0c68c
font_01_sfnt_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 18128 bytes
SHA-256: c79694d50323f7a5292b6d0b4c35d60695275ef77dc292361d526e90db961c2d
font_02_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1