Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7fd923e937a006…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 21:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8fa329748b6849f244fdbd1feb1066a6 SHA-1: 8a10b1e1ebe5df44070afe1a01322dd173cc76b5 SHA-256: da7fd923e937a0067078d28e5fd9d7d493c8a10460b6e7b05d72f591f13f57da
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting the user to the malicious URL, which is disguised as a download link for a game.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://garglob.ru/uplcv?utm_term=vice+city+game+apk+download PDF link annotation
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/62400155477.pdfIn PDF document text
    • https://oferta.lt/i/File/89497182746.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/6586c088922911c0051fd834744666e5/7526807090.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/jirajuverafulaf.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/35369446342.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/31123367354.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-19/20210919141610207008.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/gujovewuwajafujari.pdfIn PDF document text
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/60212378148.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/51922148526.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/87193463265.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/satejitudibulazunazorebux.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/44332855609.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/93458889029.pdfIn PDF document text
    • https://ewt.cz/res/file/gijuruxoxiriwumozu.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/34222208480.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/xolimugisinasufesepofib.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/38295941958.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/81067952098.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/8440030048.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161542be5bb7b6---salebef.pdfIn PDF document text
    • 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_off0000aec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DA 15048 bytes
SHA-256: 9cf3a060a5ebc43b2b6183877101617dc2b15f9b7537afd6f2fc5689d40fe312
font_02_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 10852 bytes
SHA-256: 71bc691b458a03868537c621d705e65ece0980830404c45ecbcc15a6620d6d3c

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