Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc14a523eb1080d…

MALICIOUS

PDF

68.0 KB Created: 2021-09-13 04:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cdc14b7c8ded02596a51f1f008cd95f9 SHA-1: e098ae38fd76496f4dbac744c6805d01ae8a4526 SHA-256: afc14a523eb1080d92a3a3b4ac73d122d1f1314fd6d2bdddeb1016b7e3721517
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.poliklinika-hb.cz/userfiles/file/46149811134.pdf In PDF document text
    • https://suadienlanhhanoi.net/upload/files/zewavu.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/tujesapinotobisekakore.pdfIn PDF document text
    • http://maidichike.com/upload/files/21615478822.pdfIn PDF document text
    • https://equalland.com/uploads/File/pomobilos.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/buxutezinokuronomuli.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/22200638661.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/98163803175.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/75340633133.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/82382463482.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abcb9d7d96---61294441240.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/37576303774.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/gukozulavidedabuziju.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/97321186533.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/winunuweguzomolap.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/vomagexanidasuxetor.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/61969433452.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/suwana.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/79847823957.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/kukufagapumurevumumakepi.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/jidef.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/79424133.pdfIn PDF document text
    • https://atrax.hr/files/jegojotafuvitibejojike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+os+on+pcPDF 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_off0000af41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF41 14912 bytes
SHA-256: dffce0855c208d47611e8469d0952b5b7a73b48d40daaf988b334b47f01c2e85
font_01_sfnt_off0000d447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD447 10048 bytes
SHA-256: 6597c84495a7d0ac8eaa35c464b5f6ff9a130b9f9c3dd015629667ba0174abd6
font_02_sfnt_off0000eaac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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