Malicious PDF — malware analysis report

Static analysis result for SHA-256 870dfd0ed5da72ba…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 20:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5a25f61b31207f306db832505866fde6 SHA-1: 9e747ba7496b89cfe1dab633f85bb8699f08528a SHA-256: 870dfd0ed5da72bae7bdaa6e440e936a297d8534968f9173e8944d2dede7d220
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.natursany.com/ckfinder/userfiles/files/50639538199.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161437c562c794---dorejijuxupabidatujok.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-7/20210907065919367629.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/33764942130.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/6986180685.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/59750975483.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/80039575416.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631898570.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/mulut.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210923_AE822BE06D237DB4.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109270906382993.pdfIn PDF document text
    • http://apex-architect.ru/images/file/10766648166.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ljfp80b00nmlvh1a7640fpsjs2/87147076253.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/64065619691.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/65120928725.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/30953637996.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/51917353081.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/wunesitikapusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+vpn+hacked+apkPDF link annotation
    • 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_off0000abc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABC0 10464 bytes
SHA-256: adf0b835db606bb1fbaae5572a1068bcbca1d035ce345862a93d56cf2d75ab92
font_01_sfnt_off0000c38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000db9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9F 16956 bytes
SHA-256: 79ae06b72b8b91d9d6d8cc7f955a6bad5eab84eea18d81183d9d2b1775126624

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