Malicious PDF — malware analysis report

Static analysis result for SHA-256 30297db61df88045…

MALICIOUS

PDF

76.6 KB Created: 2021-09-12 10:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb68201eb02381e9ce823093f4d1736f SHA-1: 7c5cb60cf498efbc2809565c3b287ccb67a24358 SHA-256: 30297db61df88045ae186f9e7fed1fa404bc4c5db3497e67d7d73cdd259b9668
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains 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 characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://catamma.ru/uplcv?utm_term=city+racing+3d+mod PDF link annotation
    • http://autofactory-jin.com/js/upload/files/luvowiku.pdfIn PDF document text
    • https://revive.fashion/upload/files/fuxigo.pdfIn PDF document text
    • http://isvpro.com/custom/files/lepugitig.pdfIn PDF document text
    • http://www.moyekolodin.com/files/19880904173.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/gowifeb.pdfIn PDF document text
    • https://kristinanamaste.eu/files/xalazibupo.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/tugibofomiwefixumarowaki.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349291522d7---sulewikilumudixekoselupoz.pdfIn PDF document text
    • http://stisk.com/file/81511294142.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/94016703942.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/12242167474.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v5kahvml25rtnm3up49v1iv625/14746669527.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/67478433579.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/piwebanugexolebis.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/tavet.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/kesipe.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/40854192119.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/84516488802.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/sapoxena.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/segilove.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/97723158172.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/nibudenerajapikug.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/vaxeje.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/vogusomiribodalagezezev.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090303230231.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/89207544545.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/83240650055.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_off0000c931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC931 16704 bytes
SHA-256: 219376fe4e7df67686d2a7387d4d69e83b6391a25b59a1aed7b8d0a71cf5abe6
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 10684 bytes
SHA-256: 0442c10b4c770e74b1304a5050fd6a25b54934ed6accb203a91db09cfc132152