Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd92d92153c9883…

MALICIOUS

PDF

70.7 KB Created: 2021-09-09 11:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c03dadf08865cd46dcb8222b4566627 SHA-1: 48ec3fb90c6baacd1ab771999d959e9c772c28f6 SHA-256: bcd92d92153c9883593bd4371fc4cbcd106319bead00a49ebb507e0783a7bfef
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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://smidgel.ru/uplcv?utm_term=streaming+film+geez+and+ann+lk21 PDF link annotation
    • http://rayer.cn/d/files/kudexonuvasi.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/luzitad.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/soterukepajijor.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/lutuzomeligenusuzosik.pdfIn PDF document text
    • https://ykitraders.com/UserFiles/file/47471050224.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/dopowazijukatejowixu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4b0e39d2b---41231368683.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/38234625116.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/87121961616.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/mupaxinobumurididikipezu.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/xowizokijelen.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/xejobugusovezuxemiluziwel.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/wedapimuriv.pdfIn PDF document text
    • http://dakov.hu/_user/file/tifajipojonifelobomub.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/44359186633.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/13924744316.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/60828664221.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/dasiwe.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210908231234_vsuen7.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/97108648812.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/59246328033.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/pumelimisalikusebipap.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_off0000b192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB192 10808 bytes
SHA-256: 820f2199aa41c82760be34fe5878b1ec7364ec9ede765dda24b0aa15ab814bfb
font_01_sfnt_off0000ca6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 17392 bytes
SHA-256: 7b9c69c41b68fc16200c98a0c1cb3131ec2a367dc10d7b618f78bfb8cf09260b

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