Malicious PDF — malware analysis report

Static analysis result for SHA-256 4973b1b88264a559…

MALICIOUS

PDF

85.7 KB Created: 2021-09-14 08:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8ee05d675cd0722e124515a6711109b SHA-1: a033d66be0aff54670bfa8e7eb14e3ae9106c31b SHA-256: 4973b1b88264a5594a71c35cac53e78248d486a8e40c680a1391cf215392bd3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically flagging it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/tugofumela.pdf In PDF document text
    • http://carrasvilla.es/uploads/files/62988678269.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/20495776914.pdfIn PDF document text
    • http://alvitraders.com/files/nizetelapatagimoxuna.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/sapajafa.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/xududobagujusikujawusino.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/58305823365.pdfIn PDF document text
    • http://symbolfoods.com/files/file///nafalulafo.pdfIn PDF document text
    • https://mfdesign.hu/files/file/vibox.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/21245311007.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/depetazi.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/8558672142.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/tivojejeguladimejil.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/jumeviratefoworuxe.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/27231276413.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/56756033915.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe30be8792---79059710575.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/48857979808.pdfIn PDF document text
    • http://futboltotal.net/images/files/xibejon.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/novijufizefomerogexato.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/zakotinefapuxe.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/17820419294.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/mitefaxij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+home+screen+organizerPDF link annotation
    • 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_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 10716 bytes
SHA-256: ce2e7d35927d5fd4e78bb2b2e27842570bc66e3b10c0dcc86d45775fa4415682
font_02_sfnt_off00011b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B61 17628 bytes
SHA-256: 4210534a3adddbb9c720ec739cbbbe4416e2df2808f8fa826fe026fd739c0efa

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