Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdca77b5ddc1225b…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 16:56:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ceedabac1a9bf0127707b6b049b0e272 SHA-1: a1bda4473f74a30f7ee7061c38009c16b7a4a3c4 SHA-256: cdca77b5ddc1225bf0429f55cf3efefdcdf51e7eb0849f664e4849dba49865c8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan distribution vehicle. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure designed to obscure the true destination of the links.

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 https://wastran.ru/uplcv?utm_term=protonvpn+apk+mod PDF link annotation
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a6e217f560e4c76104d56e5f76b9c45/6664727692.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/xuzatapep.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/guwanasedokolesogobelo.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/kutesikawexexoduxiv.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/bojaxari.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/94195013977.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/dubazej.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/zolidodemewafawewevaw.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/84550827261.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/35707530826.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nesevudidedigabur.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/jadobitib.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/47783048011.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/15205182731.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/tokuvisojip.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/goguzoxogodaponefuzox.pdfIn PDF document text
    • http://esistore.de/userfiles/file/kuporomadegilutusub.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/piwekap.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/44623300442.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/91483230634.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/67546383522.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/98711062781.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/33115347225.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_off0000af56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76D 10272 bytes
SHA-256: ef2e7b9cd79621622757bcab1e95d771f31fb2a56ca9d5b3114eedb811b14a10
font_02_sfnt_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 17456 bytes
SHA-256: fc1985ca9d1cfef7803142d3417a680dafdea74c563ddcb3a29e9b2b9633c504

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