Malicious PDF — malware analysis report

Static analysis result for SHA-256 f533f6403a6972fd…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 12:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e636046477d630e1f18f0430c2ba924 SHA-1: 786226ffbf978755b1ea4e297a06d45af30e9d96 SHA-256: f533f6403a6972fd8163775b883c456faa2e2290b1303573f735012e8d41dae3
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://totspotdaynursery.co.uk/ckfinder/userfiles/files/poxatenakodi.pdf In PDF document text
    • http://ambcavallon.eu/userfiles/files/49728123633.pdfIn PDF document text
    • http://normel.org/files/upload/file/kasapidurelubu.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/28127935993.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/joxutafiwemoper.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/45659571.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/16016740710.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/58840366230.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/rerujetadexi.pdfIn PDF document text
    • http://climtech.com/files/files/48159266077.pdfIn PDF document text
    • http://dnepropress.net/files/file/rajisamugoluwut.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/vitadazodiv.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/aba75f543145daf2e95fa4ab59fd3e19/wiwasejafeg.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/goxinir.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16145296fc22de---vibifo.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/5305700450.pdfIn PDF document text
    • http://cudicio.it/images/file/52586706912.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/36546376493.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/rusexupokedalifajez.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/jeroguz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=real+top+likes+apkPDF 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_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 17456 bytes
SHA-256: 8371c1c37782cb3ccffd3f88e83c2a8f32ba6d56beab25a2e90dc47dc5c5a33a
font_01_sfnt_off00010dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 10180 bytes
SHA-256: cf01e3894043a753cfb99dbccc1e04bd995f092dbc97b0dc6d65b9e733beee1f

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