Malicious PDF — malware analysis report

Static analysis result for SHA-256 30cc61c31d280653…

MALICIOUS

PDF

71.8 KB Created: 2021-10-04 07:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 970cc4e5c7b7cb308f6cf38a58791fe2 SHA-1: d17c2203c713c09f2acf64609e9c0f7c62f4f6ab SHA-256: 30cc61c31d2806531d82ca69db8794aa05cd779981c41bfb2c58625e98177181
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The PDF also exhibits characteristics of a link farm, with numerous URLs pointing to various domains, suggesting an attempt to obscure the final destination or distribute payloads across multiple sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ca020689d7a1964bf419b7ee10aa8ca3/78298143227.pdf In PDF document text
    • https://pacantioquia.org/aym_image/files/29069820695.pdfIn PDF document text
    • http://spakimthi.com/upload/files/zewinesixofodilumup.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/kobirojimimuzukuk.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/kofej.pdfIn PDF document text
    • http://laserinnsbruck.com/static/lagoj.pdfIn PDF document text
    • https://newoptic.sas-global.mn/uploads/files/13113253683.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/37023499814.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/panepu.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/2930251742.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/57456648197.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/fafup.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210924004929509334883.pdfIn PDF document text
    • https://salonrewards.ca/images/file/nojolikowexojugeronakil.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/pejasalozowapejumuwogese.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/jigupevukitifarafix.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/5964941081.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/36456241263.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/90806214134.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/tiboripetifix.pdfIn PDF document text
    • http://identik.hu/editor_up/zomeriwereduvinaxejuz.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/32324712322.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/venawefifim.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/60878597539.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/53524701827.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/94101528928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+seven+marketing+functionsPDF 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_off0000b52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 10956 bytes
SHA-256: a32af9cbd095a4ff2321d26aa43276e00b18294d423e6efe675e8a8303c98dca
font_02_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 17072 bytes
SHA-256: 45c558556851d495387a0a7d308e39e2b4efe7641d080f09c0075859496c52cf