Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4d6d0e0c7cc6ad…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 18:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7531a8ec815ebd7ad9e971eec3d4beb SHA-1: e949e148108667d8c7da00f08d4b7381a1e55a05 SHA-256: bb4d6d0e0c7cc6ad197d3412f104553c6279af46ea8efb90a4cc2ce2c7d018e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=zombs+royale+online PDF link annotation
    • https://lawyerupsmart.com/tempimg/file/74029483569.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/gowajutewugekikanale.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/58537440448.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/9851474038.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/fevubuwetomapo.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210919225134.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/18146354186.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/sipawitupifofunuxudotum.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/megedawaxikuben.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/mitodesesikowevilegidare.pdfIn PDF document text
    • http://contextuae.com/resimler/files/75568798546.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/87945063734.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/15907756220.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/59169583247.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/41109897867.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/xajurojakukidimij.pdfIn PDF document text
    • https://yifff.se/userfiles/file/sufojadebakomadu.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/lepikanifalumafof.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/94994405052.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/33519460522.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/fudumomiwanituw.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161444b463dc69---gavitajux.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/38093744145.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/rumukovilewazobonefama.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/boxetu.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_off0000d7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF2 18252 bytes
SHA-256: 723f710651097f66941ac6133248f8e9df7e54f9361a92d4fd1cf2b6fe652520
font_02_sfnt_off00011f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F88 10388 bytes
SHA-256: 18a46c35e781301d0bab1b38a087dac10328790ded9d0eb40c9855d115379671

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