Malicious PDF — malware analysis report

Static analysis result for SHA-256 4216411daef8a570…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 10:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cc6e0d0957d2871892b62f5520881d50 SHA-1: 060413335c7acb0ef494b116fde6ca82f3afd72a SHA-256: 4216411daef8a570e4a284a3b9dcbfa6c014bbebe02660529778d9c037f97ede
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are linked to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://hfnhsw.com/upload/files/befejoxekewat.pdf In PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/rutolerefozasamo.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/gipasetugojovezilulijulul.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/80136314081.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/89404059568.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/59333284145.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/bifotugejolewisegip.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/tixuxafejuxovav.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/vexugosumomugesi.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/49945728077.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/govomo.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/galinulobon.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/19361089597.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/22549645927.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/101031074217.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/nipefusorewudibegawaxeken.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/16859483800.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/74927882612.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/56054311374.pdfIn PDF document text
    • http://sin-hua.org/userfiles/jonagesexidapekoza.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/xodevizasax.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/69765293154.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/zupogameb.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/87851003392.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jm1o5kefl71qvs0qjrv1s9o1p4/tetowodasoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=describing+words+starts+with+ePDF 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_off0000b0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B3 14876 bytes
SHA-256: 1fe76b459420f15ca133365aa833606c95a6dcc7482f99442f261e4e0495cdf0
font_01_sfnt_off0000d638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD638 10828 bytes
SHA-256: 8194f8b598fb0393e0d4cc5a426f0195804665b02a036f4bbc715c87f5b872d4
font_02_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1