Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bd021cb58e8e87…

MALICIOUS

PDF

89.1 KB Created: 2021-10-08 11:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c21cc0c7020ddb7d1458eb61ac72667 SHA-1: 8e4fcee44607cc2f38294d8e731a42fcfa97b79a SHA-256: 75bd021cb58e8e87851fd17a2f1d082d76293031b725b579014f54b6163e7da9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://toitureetfacade.fr/data/Files/mobeki.pdf
    • http://ccsctda.com/ckfinder/userfiles/files/20210906_044729.pdf
    • http://slovoveri.org/userfiles/25828918830.pdf
    • http://limeitec.com/upfiles/editor/files/gakovuvalazipidarunip.pdf
    • https://millvalley.com/wysiwygfiles/file/nazakazivux.pdf
    • http://humanconsulting.cz/media/file/68047228165.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613da74a2cdde---zudapefuxoratiko.pdf
    • http://barsugo.com/ckfinder/userfiles/files/4678832789.pdf
    • http://koryosushi.com/uploads/files/89962682961.pdf
    • http://ayurvedicclinic.org/userfiles/file/mojeloroxobifebetamelame.pdf
    • http://csc0532.com/userfiles/file/20211003142916_w0b4jf.pdf
    • https://bikeid.net/ckfinder/userfiles/files/98558027815.pdf
    • http://dulichgiahy.com/upload/file/fiwusomapagefujususidazo.pdf
    • http://karpatskiles.ru/store/files/32481802246.pdf
    • https://soosekszer.hu/upload/files/xomukawolegovomamazuse.pdf
    • http://venusland.vn/app/webroot/img/files/kelixune.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/zuniwatuwilusu.pdf
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/wizelema.pdf
    • http://bsp-oblspl.org/ckfinder/userfiles/files/81685340909.pdf
    • https://bio86.net/userfiles/fichiers/82949423315.pdf
    • http://kukubara.com/zdjecia/file/85318248154.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161561f991cc69---61417245218.pdf
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/bejiwemudigusubom.pdf
    • http://transporteslaplata.com/imagenes_web/file/pogipoxodegererototeki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=matthew+perry+drugs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f189.bin
740ff11d211804920dbba129cc8fb1c9d50161d450b9432d469a5223d48c974f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 20768 bytes
font_01_sfnt_off00012719.bin
fa816bd964cf588993fda26a80b002b34117f3e82da25afae43f1fcc3f8e3345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12719 10600 bytes
font_02_sfnt_off00013f54.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F54 16792 bytes

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