Malicious PDF — malware analysis report

Static analysis result for SHA-256 e377adbc9b6ed0a7…

MALICIOUS

PDF

69.4 KB Created: 2021-09-19 08:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b78dd282b5e5af7b24e1e755caa8d610 SHA-1: c022e4a747a728816d343f3f937744a99c4a4327 SHA-256: e377adbc9b6ed0a7bf493f42a0b414c0b27ac3c883a23cf04f1b856421e350bd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to one of the numerous external URLs found in the sample, which are indicative of phishing or malware distribution. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=a+long+time+synonym PDF link annotation
    • https://biographiewerkstatt-singer.de/userfiles/file/kojin.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/29836068735.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/fipido.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/53207836564.pdfIn PDF document text
    • https://shidoremicrosys.com/media/jitarisumetinakuloribewer.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210918203656.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://santehnika34.ru/images/file/88794969028.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/26187308973.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/83855095536.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/bagavivesuxidisa.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/38979177257.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/vogus.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8895676227.pdfIn PDF document text
    • http://ceroki.com/image/files/11978972081.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/20378138607.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/5585100846.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133a95286064---wupunalasin.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/bilirakogexog.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/kocjtb0s4kib6impp2nj1e6e57/dekivusivanin.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/38894516748.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_off0000afba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBA 10284 bytes
SHA-256: c3c0d0f5f54cd7a78d17db1c41016323e7f6bf892acbebeb1c4c022695de1b4a
font_01_sfnt_off0000c6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E6 15872 bytes
SHA-256: 031996bfe4dd24119146bcc1eda4a8045c22a6e3368031d5db3b2d1c387142fa
font_02_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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