Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb8b9c4f16243bc…

MALICIOUS

PDF

69.2 KB Created: 2021-09-16 13:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7380f50346d04bc2eb3c998ac50a001e SHA-1: 952e257c25ef416b50e055851f8752781b5b50a2 SHA-256: 4eb8b9c4f16243bcae00dffa8707a0b859aeffc64448405f45b0b4ab9167f662
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior, indicating a high likelihood of phishing or malware distribution. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.startservis.sk/novy/ckfinder/userfiles/files/tosuvusek.pdf In PDF document text
    • https://wedding-photos.cz/userfiles/file/xiwixejexalunobowibok.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/powuxivalegotelava.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/kaguzuxalewez.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/86278829655.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/51390797780.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcdbf5edce---75167594642.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/81369124088.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/xixutijasitojeko.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/37127938635.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0b71c842---sipavax.pdfIn PDF document text
    • http://yilip.net/userData/board/file/9765528041.pdfIn PDF document text
    • https://pixel.bg/img/file/jonibufejujozosirubipi.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/nitidelexa.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/1472216794.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/mubagiturag.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/34724953124.pdfIn PDF document text
    • http://veitali.com/upload/files/bimewexaraf.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/49782030430.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/1df37680e130f23752c9a7c1246c5d49.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/10273690502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=upx+unblock+websites+proxy+browser+kjeePDF 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_off0000b088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB088 10976 bytes
SHA-256: 50c2fd275cea87668b70a409ab74bf99c568172a1d905a376792c0af5623b7b2
font_01_sfnt_off0000c9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FD 14768 bytes
SHA-256: fa242b165687b24f50b2ec9d781d9b946d638ad024ed73ae3fc61d832e19a74e
font_02_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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