Malicious PDF — malware analysis report

Static analysis result for SHA-256 4467b98d935028da…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 01:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d7863e34957bd30cbc558e95957af18 SHA-1: fb0912646b54fd9636371708d42964743a742afd SHA-256: 4467b98d935028da89594940e07fb8d57e742b662fc38cc03cd26042c17cdcc0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure for distributing links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=send+mms+from+iphone+to+android PDF link annotation
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/ranagijumeno.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/denimufojovuso.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/sokatirafilelufopunemabev.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/dotiroxalurizoxa.pdfIn PDF document text
    • http://com123.vn/uploads/file/farokijetok.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/texifigomivuzo.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/55628514174.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/57909058.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///fowutonufij.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/zizixire.pdfIn PDF document text
    • https://penzion-palice.cz/content/80753843738.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/11671704110.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/60397198138.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/32715174009.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/sepopuzi.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/kodobunuzomafiwem.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/72359272176.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/53860785512.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/55fa913519af92436a618ef58e6f2fbc/jawafutezutuxulebi.pdfIn PDF document text
    • https://inarsindbari.org/uploads/fusijunonosev.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/57394375078.pdfIn PDF document text
    • http://heizler.hu/files/file/mivizatedexutose.pdfIn PDF document text
    • http://osayit.com/images/file/47030590656.pdfIn PDF document text
    • http://pasaru.com/upload/files/60730742984.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/raziv.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_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 17660 bytes
SHA-256: 1e65e4893f173ba997ede293a0ec2eafbca5797378f7f313c26014b4e80696e0
font_01_sfnt_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 10792 bytes
SHA-256: 7a25e240f151709b8b3cfc19c7189f2a7213172a412675e1e5811620f5e1ad03
font_02_sfnt_off000125df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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