Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f32201716bcd6c…

MALICIOUS

PDF

76.8 KB Created: 2021-09-11 14:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 472396283adf855115d33776cd9b2b14 SHA-1: 8772a2c9b16809fee1ef72a03b613bb75e044f19 SHA-256: 03f32201716bcd6c51361fffd913dd1cab9ec6521f9fcb2413cb2e932849c00b
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 heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=steam+link+for+android PDF link annotation
    • https://macroedunet.com/userfiles/file/legabopawanovil.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/61108721935.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109041559594415.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/fajexunubemilifazi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6cb32922eb27d9032aa5fe1365b679dd/88561362988.pdfIn PDF document text
    • http://congluc.com/upload/files/7490873793.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b5bf62eb6572f5577694456f1a34ef5a/32191673956.pdfIn PDF document text
    • https://polandpools.com/contents/files/6629791610.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/xopudatirogikaler.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/sekivenewinuruleviludabok.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/pusifupuletibos.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/67069126543.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/walokate.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/dawolokibifutelakex.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/12094188066.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/vudepemigizinimafubime.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109030950435028.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/fabaxuvisumuwibifev.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/98119777545.pdfIn PDF document text
    • https://tebra.si/userfiles/file/1577174021.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/63609200582.pdfIn PDF document text
    • https://premiersuli.hu/files/files/vizoguda.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/nepin.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_off0000cb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 10512 bytes
SHA-256: 612a894311a8c209e81b3bdab259229b8f50d00814c58af1a7cc8f94dd3bce44
font_01_sfnt_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 16496 bytes
SHA-256: 536bd2ab5fcf0036bc6528cd46c59d8b570f22703b30e80e020fdf2cd0278ae0
font_02_sfnt_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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