Malicious PDF — malware analysis report

Static analysis result for SHA-256 766125499e3de34b…

MALICIOUS

PDF

80.4 KB Created: 2021-10-05 05:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5bd8d5c81ae3290c62579ca3873dbc30 SHA-1: 8091832abcc665c083443c03841d1062c70832a7 SHA-256: 766125499e3de34b1fe91b5578d891fe882219f015716425fc4177a7d7852353
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating it is a link farm on disposable hosting. The document body was unreadable, but the presence of numerous unknown-reputation URLs suggests a phishing or malware distribution attempt. The primary goal appears to be directing users to a network of suspicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.ondebiz.com/userfiles/file/fegekebisilisama.pdf In PDF document text
    • http://ambvetfanini.eu/userfiles/files/damorotinogok.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/pozokevazel.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/8024013715.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16157033115623---zebuxogodumuwulip.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/22143803392.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/84087634008.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/saviwer.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109250547133590.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/sibaduva.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/busenekelu.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/46835442893.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/sexutiwoleto.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/2824239061.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/risaselisaga.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/liralobowepozifobetagur.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/6922443135.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/64356587999.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/sanif.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161360a0159349---dibatesaxadalepu.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/46173427602.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/bixawazesijab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+domesday+book+wasPDF 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_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 10468 bytes
SHA-256: f5ba6b4bc80840f0fb8c60db7c3d6c995a24cfd372b4c6aa0c9d73bb69a26361
font_01_sfnt_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 18388 bytes
SHA-256: 43912b29e7a8aa2d2076e3fb8f07212873ee99330f0b2a8eb8240a917a5baa6c
font_02_sfnt_off00011c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1