Malicious PDF — malware analysis report

Static analysis result for SHA-256 25064a90ae341347…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 08:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d472944324635ee8bf7432d7ce748b38 SHA-1: 40ed3169651d8a2d1fcd56cd03b91ecda8b1db55 SHA-256: 25064a90ae34134774b416d04f27a372bb51a1f2fa88d193dd5aef165b4a1170
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download further payloads or redirect users to phishing sites. The embedded JavaScript is likely responsible for initiating these actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=floor+plan+creator+cracked+apk PDF link annotation
    • https://akrmedia.no/ckfinder/userfiles/files/noramejujifivig.pdfIn PDF document text
    • http://grupophi.es/uploads/files/51094110070.pdfIn PDF document text
    • http://sbkf.org/files/files/81091757109.pdfIn PDF document text
    • https://cian.hr/userfiles/file/20372131471.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/58906610924.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/jujosotoviraxi.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/vitoxugun.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002af691e2---nulefebadimejujaga.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/41003585226.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/pitokupovusapupoxim.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/92718145460.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/deropufaxedavaja.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/50787966654.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/gijulafaginenimopofoxul.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902040443.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/bexitubop.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/xelofobofarebemosufuwifil.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/tukopupuninuroragunofuva.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/fogizojogifemazafofu.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/bexazibibizajudidebus.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/dafunug.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/87412570647.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/17277462208.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_off0000b2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CB 10316 bytes
SHA-256: 81cf254945777bea66f1f327e96d1b92c0605c6f87ac38ef1e03cfcaf0ac1ef1
font_01_sfnt_off0000ca26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 18516 bytes
SHA-256: 8b3c7417ba8b04053f7c60b0437984a7c1b85a75388d52b0c579786cd5c45221

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