Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb72637761c3088…

MALICIOUS

PDF

77.4 KB Created: 2021-09-16 20:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 109168152840ba6ce10d83bd1d449179 SHA-1: ea0d13daf3ddd2f576e42051f88d11ef8d9a3bd7 SHA-256: 7eb72637761c308850643e3366051a6ef405224f6d0adbd6dabcb68945128daf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://krisoc.ru/uplcv?utm_term=pokemon+go+no+root+spoof+2020 PDF link annotation
    • http://sukhonthip.com/file_media/file_image/file/ruxibivonemagolik.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/zedilemudidasubupadudulu.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/77725911498.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/zimeku.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/gutupebored.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/mudukemogumireko.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/kudipipovovifof.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/68978980704.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/foxofopefobelu.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/63721614247.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/4567911747.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/58351888198.pdfIn PDF document text
    • http://oilspecchem.com/files/balaferipewodoxuju.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/58264261473.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/85191167961.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/geriwoweramukarivuz.pdfIn PDF document text
    • https://flammerouge.ch/userfiles/files/lizumesofonodefuwixo.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/vuvonox.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16138e937d7f7d---wuzoxesiwotefogoxuvagi.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/wovuzofepubofidekunaxex.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/moberagotaliwemajixibijo.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/99153193674.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde8f52ed9---walazu.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/21059328631.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_off0000c786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC786 18312 bytes
SHA-256: c457a88f579617a99512b09d5deba8b98a22bc43e3130ec7ef3eca46b9fc9581
font_01_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 10736 bytes
SHA-256: ce8d600b71bac1345e76a77b87d1bca50ba5130169b7957dd82520932ab25520
font_02_sfnt_off0001100e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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