Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e870409a4c609d9…

MALICIOUS

PDF

76.0 KB Created: 2021-09-27 08:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2c7d011b44d8c513892ecb1a806231b9 SHA-1: 90a45d0923dd4d2f3faf955eaacef164c0b9b248 SHA-256: 2e870409a4c609d9cc4772d50d4b7a04b03ec4e26927f35170022a7f6a4aff79
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs pointing to disposable domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a link farm designed to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=xz1+compact+rom PDF link annotation
    • http://fluorescent-training.com/file/63827007468.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/5683467118.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/21702543949.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/fasarumi.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/63246765629.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/45623502437.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/nugexunezazopam.pdfIn PDF document text
    • http://mweb.cz/images/file/dirikerosukopiwowasepodot.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/watilukekajopi.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/50835559097.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16145ee4e8043a---keruperipoba.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/2885373576.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/2110263071.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/xivezepifoxodajiti.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/noxozefizef.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109261635282456.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/16334639435.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/paravivesuneju.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/gasozojigazudix.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f774d63e9a4eeada0347f78524bd0ec6/jubokekigejolozizi.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/jazukike.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/vuliluwidilezenidimuga.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/40943608038.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/vosegeroxako.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/40740933733.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_off0000c07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07E 19636 bytes
SHA-256: 7a81df8c824fa7621fbbf94b513e9f61a635557993ab1626c1150fdfe40ec500
font_01_sfnt_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0C 10112 bytes
SHA-256: e19bb9b32ed2f8d8d715f7e98b7f6d2a548dd5e0cfcd392f46ebe7a619fbed84