Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de62579e19e1c19…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 02:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5d5d3c5a6c84dee683c380514048c578 SHA-1: cda13e35cae928bf60548ab00c0214de570242e6 SHA-256: 5de62579e19e1c19688bc566115c1e0b2fd6e7c077faa137d26bdd35a7661d76
134 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 PDF files hosted on various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://daulte.com/ckfinder/userfiles/files/98917355016.pdf In PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/ziwikikefev.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/xatibode.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137ae484b151---63682761844.pdfIn PDF document text
    • http://videlec.be/ressource/file/51030259209.pdfIn PDF document text
    • http://www.ezmoving.com/file/bexinelusadefulusananudo.pdfIn PDF document text
    • https://phukienbep.net/media/files/malureduxubexox.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/83528734915.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/kajad.pdfIn PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/xotupoxexevakuj.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/mabamevawivaxofusiwowa.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/zeduvesodimek.pdfIn PDF document text
    • https://ratosatu.com/contents/files/22950325558.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/gemipitu.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/14702925859.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210901080133.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/ruzijimesapowojalirugo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130143160d24---juguv.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/51403639340.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/12774300489.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/webemezosupukeliluxem.pdfIn PDF document text
    • http://nincity.de/inline/file/51411649745.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/2764307036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=chaturbate+premium+apkPDF 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_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 18596 bytes
SHA-256: 2e8ae32526acff556c93190e09c85b39fffeb364f1daa1bfb5e825a4943aba24
font_02_sfnt_off00012478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12478 10444 bytes
SHA-256: 2d3599b4b7b6486731f5db02576173832c37819d900c50944fa8f0d9ee808afd

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