Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da098736f90e56d…

MALICIOUS

PDF

75.4 KB Created: 2021-09-16 10:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fe8fc6c27f97fbb95ebec740a7292e32 SHA-1: 70cd8ae450991165fe4aa9ac57fe2f9372366b09 SHA-256: 5da098736f90e56d5fd04d2f047381b6aac5f437d018a645698dcb0cca3d3cd9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The presence of embedded JavaScript and numerous external URIs, many pointing to disposable domains, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be junk data, further supporting a malicious intent to conceal its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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=find+my+device+android+by+imei+number+online PDF link annotation
    • http://spharma.ua/files/file/87330187658.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/14421188308.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b8bb5fd10---87993634380.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/80970441748.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/fujofarilobaderalunugi.pdfIn PDF document text
    • https://kimcert.org/E/file/10637561201.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59734157649.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/72292416578.pdfIn PDF document text
    • http://videlec.be/ressource/file/7795329174.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/23862894339.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/71037548563.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/30060197707.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/minoruzaxukibarudagege.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/babisubetezukux.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/jonunaripuxurozagumij.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/20798082740.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/vupidelofuferudugatere.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/retapovomomixuvalepuwarur.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/99021381968.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/aaah3v7a3kd45325lsue6thbbp/mibabuwijulatum.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/parufipifaviwe.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/xapabuxur.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/tomedizineb.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/kewapevopikoruxi.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/mijofixesazegajowi.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/83440151977.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_off0000c3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D1 16596 bytes
SHA-256: 5a24bc69437b7ab9bf1cb41d89b3c77df15093fbb464c593da6dcd5424494910
font_01_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 10660 bytes
SHA-256: ff28c95b7188a59d21cc9b8540531050713fc374e4a0eaeabf72d28bc33c598b
font_02_sfnt_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1