Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc38cee8be35fd5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 03:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4f1bb296bdfbfe3c21d3d71e2268bb03 SHA-1: 0f765420d6430047682abc3dc0002cf7d77835fa SHA-256: afc38cee8be35fd537d2b7daa7025c643de17c98b565ffec4462161852386979
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, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to redirect users to malicious content. The `wkhtmltopdf` authoring application and the presence of embedded URLs indicate a likely phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=why+my+playstore+cant+download PDF link annotation
    • http://skia22.ru/pic/file/tebimu.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/36322489059.pdfIn PDF document text
    • http://strap.sk/uploads/file/tisazedurut.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/41776916725.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/548581284.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/vegasefupumisuwe.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/bapevuge.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210909104809.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d7313e923bf579827ff94736509fb1ef/pesubibixivu.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/vujotisetixudevi.pdfIn PDF document text
    • https://castel.ro/userfiles/file/jirevifivinur.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/kuwitijevanuz.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/84209914734.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/tutikiva.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/20719482690.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b23b155ff4---54758625590.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/96425948770.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210904130913.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109212324332827.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/rugedajajoba.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/rotilexeniv.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/42596594152.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/48511116359.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_off0000da5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 10880 bytes
SHA-256: a565537b38542fea1949b08236f13e81c73b6b8c90fc74a70b0106be7aba2fae
font_02_sfnt_off00010b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 17740 bytes
SHA-256: 61b27ae570032ad7445baf25433d812346e85f6c2f4a47b6ee9d489ba1ac5cd3

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