Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc8eeda582bf94f…

MALICIOUS

PDF

72.3 KB Created: 2021-09-18 08:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab12498f6c9a9fb8f5b0159d18fb488d SHA-1: dc968b9536455bc4399b29cfc1f027c903b3f68a SHA-256: 0bc8eeda582bf94f1e736bdd538b9dc6a85b2791c9b68b5c1987c8c86cbbdd16
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm, a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://chcial.ru/uplcv?utm_term=balance+de+materia+y+energ%C3%ADa+procesos+industriales+pdf PDF link annotation
    • https://ikuseikyokai.jp/ckmedia/files/36824570241.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/13062830152.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161436ced0a7c3---noraralerasotexokevovekin.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/11757535033.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/sepokumonesedem.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/rotejuvudowigup.pdfIn PDF document text
    • https://zzhqhi.com/d/files/jowobixol.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210915170412.pdfIn PDF document text
    • https://renewone.de/files/kemijimupi.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/zaragemepuzuruxuvuzexizu.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/60130764314.pdfIn PDF document text
    • http://novafish.it/userfiles/files/33285934052.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/geluvolokojelo.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/95464510160.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/43251626648.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/2213399297.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/rovera.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/28799078114.pdfIn PDF document text
    • https://edex.co/userfiles/files/vadosekelidasuraxutoruji.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/79299313212.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba5f2c6e9a---96401909171.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/sixasamutederaku.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/movapetuse.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/91998679802.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_off0000b753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF65 16072 bytes
SHA-256: 9187240921078c7664cb88b35b8e83c9a402aa519ac8f0add0eeed8e5d64b617
font_02_sfnt_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 11292 bytes
SHA-256: 14c03080a2a6f4905164a3093f8c5879dc53527d5707eb2271a85e1b2dd5e01f

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