Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc98650d579b205…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 01:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f6b1ca58ba26abcf878a31e59b5f8d1c SHA-1: 96d2e0c1e0f1406526c4bed70b6fa8480ef9efb1 SHA-256: 9dc98650d579b20519c599349cbd463a27a3720c2ebdf963b79474b5464acbb5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=mobile+legends+bang+bang+pc+tencent PDF link annotation
    • https://fiberglasssupplydepot.com/userfiles/files/masukalafefo.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/6335472469.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/59314014829.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/sexakujekuroxeru.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/64790333267.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/bipexiwakad.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/95222477106.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/rerejiworagopapumedid.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/xekesigej.pdfIn PDF document text
    • http://szcftz.com/upload/16654433710.pdfIn PDF document text
    • http://donghotam.com/luutru/files/loxavizijorap.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/n80v9clktqu9ikdsnkcsjrnck0/32562845033.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/vabogoziramabalopibem.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/sivuretusuniv.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/1582168044.pdfIn PDF document text
    • https://brs.jo/userfiles/files/xiborexemodibujaneputeziv.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/50639644576.pdfIn PDF document text
    • https://meridianchem.com/meridian/ckfinder_userfiles/files/tesinunemoz.pdfIn PDF document text
    • http://charontrade.hu/data/file/89157809041.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/rixuwagabogi.pdfIn PDF document text
    • https://raljob.com/userfiles/file/67098838481.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/lomemetoxalubi.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091318535938.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_off0000af9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9B 15052 bytes
SHA-256: abb2a4f7b3e128e98b5024c159ba77546e172a0de8833dd508fc25254d417e89
font_01_sfnt_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 10724 bytes
SHA-256: 267710108190486b28d56de7fed81940f42e38ebaf2d14a60ec74d4fa10c4aef
font_02_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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