Malicious PDF — malware analysis report

Static analysis result for SHA-256 e854a642bb47a715…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 06:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b9ac7ee736d06a472dfbd51477a0f031 SHA-1: d71ab8897667e3b6a38d6cf45302c3f4ed892abd SHA-256: e854a642bb47a71523ea7c25c90613496c3990c450f013874b7084c7d635349b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its deceptive content and redirection capabilities. The presence of many unknown reputation URLs suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://skywaynepal.com/userfiles/file/60946758691.pdf In PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noxipizifoba.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/gasogisokakofizogugofa.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/dovikakawe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371f4f53cf4---pukopava.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/44486837949.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/sinagudejezituwipij.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/79583136778.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/bepewugijabunevezow.pdfIn PDF document text
    • http://zae.me/datafiles/file/86037473226.pdfIn PDF document text
    • http://rld-carbon.ru/file/nupufofolulodusix.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/budin.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/29948485234.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/tenepirijo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613936daa4e05---siwigikisafolete.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/3134240778.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/koketolajudunividetileb.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/kemone.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/27101221606.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/jazivutopimire.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/80478944607.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/fimalovifijexu.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/suruwinux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=disable+screen+mirroring+androidPDF 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_off0000c725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC725 18068 bytes
SHA-256: 9038117fc7f6867bec9b1f4f53162038988beb2233647568255f29c28718e1b0
font_01_sfnt_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 10756 bytes
SHA-256: 8ac4dee02564789a1b77893c8c7727ea5e5a1c4244326496ae2c1d04b18ccb90
font_02_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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