Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a03b843d9f12bd…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 05:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e6ae656ffde293b9e52814b66e3a0c80 SHA-1: e8d496b7c25c966408fbe93bc20e059f611eb4c3 SHA-256: b7a03b843d9f12bd2d0b5d376feeadd1b7520a38e41183d7f65e66610facc122
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to link farms on disposable hosting, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, but the overall structure and URL patterns are consistent with a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=mario+and+luigi+bowser%27s+inside+story+rom PDF link annotation
    • http://fygl.net/uploads/file/131111233097.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/64342416620.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210920144918.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/kikuvifebomivuwerugeb.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/73608070413.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/40455030010.pdfIn PDF document text
    • http://gugugroup.com/userfiles/39425483419.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/20585012894.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/40716631526.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/fuxozosagozokut.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/39200714882.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/lutudamitilirolinitu.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210908_064438.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/dazowo.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/29619643418.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/loxukaramupe.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/dakiw.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210919065500.pdfIn PDF document text
    • https://inarsindbari.org/uploads/37007592709.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/84891346613.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/31651554646.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/robizasunigudel.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_off0000b1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D0 17604 bytes
SHA-256: ec9d399641e52e534b3e475b6b630ee85bdb540e0c741ccf168f8f9a8c227d6e
font_01_sfnt_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 11060 bytes
SHA-256: 7575b74c8910fff4fff82634386c7159a004abc63b55e51c5f4d4c3b2e84447e
font_02_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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