Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae05b31fbecd956…

MALICIOUS

PDF

87.2 KB Created: 2021-09-12 01:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73051765ef2a899eac001e3885681d07 SHA-1: de3122d2991bf744ff6f47f8779911fd1beb3793 SHA-256: 8ae05b31fbecd9561a08220404e69a0191f396cb199123c30707e59c63810ca3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of an embedded JavaScript stream (T1059.007) suggests the execution of malicious code, likely to redirect the user to external URLs or download further stages. The numerous external URIs, many pointing to PDF files on potentially disposable domains, reinforce the phishing or malware distribution vector (T1566.001).

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 http://eco-versute.com/app/webroot/ckfinder/userfiles/files/90768628178.pdf In PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/bagowuwabiladavesuxewol.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/logedozugejekolabovekozo.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/24135147598.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/jiwezidevame.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/bafeji.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/xavirujipak.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/22287198140.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/57955093211.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c4f9b1a96---35984048112.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/rijixexogepekonup.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/74352683911.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/fobunikanugif.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/28097797318.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/40731191745.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/fuparadowofozumimomonur.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/terusitirimikok.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/96640358571.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/giwafezoruj.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/dumumebet.pdfIn PDF document text
    • http://iucecb.com/files/file/maguvuwajefo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50f1401e7---2386331057.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/63504961322.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/sororuvaviruzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tuning+club+online+mod+apk+unlimited+moneyPDF 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_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 10996 bytes
SHA-256: 9cd3f7dd3f93377a03c35895d33074fd86f06a8334d7f05e2599ef9ea69b7c01
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6D 18424 bytes
SHA-256: b73463075b54b0f8f87a6d33693fd30de57999ddfb4bb35661b6aae6cfe75830