Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bc735b48908394…

MALICIOUS

PDF

94.3 KB Created: 2021-10-11 16:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 05a2bbde312bec666892b5752b4e4ccb SHA-1: e6bfd116d8f4f9cb22988436f57710a7d231e42d SHA-256: 10bc735b48908394d46a30f9def6d2cf33b976e306c2a52b991b94c4f7141c26
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to domains associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The embedded JavaScript is likely used to facilitate redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=bubbly+colbie+caillat+cover PDF link annotation
    • http://sapientgenerator.ru/files/userfiles/files/28976264661.pdfIn PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/vodod.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/66831981229.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/6520392930.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/divorepexaxafon.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/fupitulumitofozuzu.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/68594069499.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/55951696456.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/debeximakalapipudozivubos.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/69333424146.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/lupinafikitat.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/76271412737.pdfIn PDF document text
    • http://gysanya.com/upload/file/211009044550812775jp234w3ao886.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/63491593853.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/55440878387.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/96034113827.pdfIn PDF document text
    • https://2acontractor.it/images/file/tadesamukew.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4747566708.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/35587137009.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/84203956197.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/9715200897.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320c35e8a4f---39341088485.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/dudowumewokeguvu.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_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 21400 bytes
SHA-256: edca75ddd4bc94b1b8e0d5c8c8dce939a4b525140a1d7bd75e858b164b2c5031
font_01_sfnt_off00013a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001521b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521B 10424 bytes
SHA-256: 99e109ad7652c2977bc120ec38e363917467d482da7aaa126a224e5dd6ecc0b3