Malicious PDF — malware analysis report

Static analysis result for SHA-256 88835e2f93852bcb…

MALICIOUS

PDF

78.1 KB Created: 2021-09-15 16:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 879694c6e88cabb0770e04d85301d2da SHA-1: c8be93f7737b53b3f843b5f8b6c64d238d4e3de8 SHA-256: 88835e2f93852bcb5e06ea69336c570f7d6193bbef5d5b983f174c361368ade5
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7432

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.
  • 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
  • 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=free+robux+100+legit PDF link annotation
    • http://iwilldoit.ru/uploads/files/files/witejejeka.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/depojajejaki.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/wajobutejijonabisuju.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/xamoxawamak.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/fefakabojesagutezapob.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109111854114098.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/lifujitaxudorenevasubalu.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/buwokiduvakinizomuke.pdfIn PDF document text
    • http://hanleyresources.com/images/mafilokivofaliviwirilor.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/20332512917.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375d5fbeab5---45996733311.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/zobixek.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37788355972.pdfIn PDF document text
    • https://hojoairport.com/images/file/lojapukusugivexotivifed.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/zibifomuwowogesajigo.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/vamiraweza.pdfIn PDF document text
    • https://sapsda.com/SapmaUserfiles/file/sezemabujedinoxo.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/36298099045.pdfIn PDF document text
    • http://mobitransjogja.com/files/35944514359.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/gedot.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/71136357343.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/3372589119.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/29572573203.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jikigisewelal.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 10340 bytes
SHA-256: 69718c7760b60cbca42ec8d48f6bb3d613981900ae68d1432c0cfdb8ed6149a2
font_01_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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