Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad24c4d0bdd1116…

MALICIOUS

PDF

93.7 KB Created: 2021-09-12 06:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46dd0bd4caa572c96c7f008fe9580ea7 SHA-1: e41c091520e0261bddc566965cfcc44aee2b23bc SHA-256: 5ad24c4d0bdd111672c14615e79867ebec7850270c72771ffe2daa1f597c48da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to obscure the true malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=come+avere+permessi+root+android
    • http://sp2wronki.pl/fotki/fotki/file/61168704360.pdf
    • https://groupunsur1.com/contents/files/vexuvipefaguvage.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/bisiredejam.pdf
    • https://millersexpress.com/userfiles/file/ponupikawaxiwomez.pdf
    • http://friulanamarmi.it/images/file/69784438581.pdf
    • http://sjatupornservices.com/file_media/file_image/file/vevisebiwilit.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d133064b9---91456123905.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161338310be884---13939866098.pdf
    • http://manu-transport.com/documents/file/95502093803.pdf
    • http://fanti-fitness.pl/uploads/assets/file/30936785638.pdf
    • https://www.algeos.com/js/ckfinder/userfiles/files/44124869939.pdf
    • http://younewstoday.com/task/userimages/file/panisolo.pdf
    • http://noahmission.org/dataroom/file/xunalofovumipozafisek.pdf
    • https://gulceoyunlar.com/calisma2/files/uploads/1572101904.pdf
    • http://yossy.biz/userfiles/file/wozuxutofejerububojuru.pdf
    • http://greensquares.in/userfiles/file///bokanilekevuraluf.pdf
    • http://dailitara.lt/bites/uploads/file/36180462644.pdf
    • https://steammining.com/userfiles/file/55642586679.pdf
    • http://rund.cz/UserFiles/File/movikujirilavide.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/marobogewefa.pdf
    • http://wieswioska.pl/userfiles/file/36313157638.pdf
    • https://doctmcooper.com/userfiles/files/37159624990.pdf
    • http://files.ibiza-ferien.de/file/wakigekebavukalumevu.pdf
    • http://wsp.pl/userfiles/file/kamijezelatafube.pdf
    • 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_off00010802.bin
a674e30262f5d49da16d12ff7af4edecd79640068103fab7771370e929b608e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10802 10604 bytes
font_01_sfnt_off00012040.bin
48083596de60587e8520ef56588951c6980390025bfa5196ccafc828fba2557f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 18292 bytes
font_02_sfnt_off000150a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150A7 16792 bytes

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