Malicious PDF — malware analysis report

Static analysis result for SHA-256 993f74a12ec54dc2…

MALICIOUS

PDF

88.2 KB Created: 2021-09-11 15:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f0ba05fbda9fa6691bb1e7a2f5c0c9cf SHA-1: 51ce8fce29e1c092de48c3c36708ec5c90842b9d SHA-256: 993f74a12ec54dc28c08239236ad7babd566bf592b79215234f4e4aea4e681e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The `wkhtmltopdf` authoring application is noted, but no specific scripts were extracted to detail further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=wrong+turn+1+movie+watch+online PDF link annotation
    • https://ismet.com.br/ckfinder/userfiles/files/75337940323.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/15054588276.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/koboreju.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/54691010176.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/26313209929.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/29604627771.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/20534668166.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210903045321.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/90737029530.pdfIn PDF document text
    • http://youil.org/userData/board/file/51024330040.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/gitote.pdfIn PDF document text
    • http://ccshecea.org/upload/files/domujerosorodus.pdfIn PDF document text
    • http://contextuae.com/resimler/files/fajomokomibi.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/kalekiromakogokir.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/vuzowawasatimerunetizuw.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/pigamuvebadatesusowi.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/gibisupononalaposojagozo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131362f57ed2---48268890160.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210902_7BDD704A69289FBF.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/mafipuzisivajuketadesofa.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/vunuzujuwazafajelasata.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/fezolulu.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/zotisanozazetinanazoret.pdfIn PDF document text
    • http://hotechike.com/files/files/94679364469.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_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 10804 bytes
SHA-256: da6d214a9ce49b3e741170ae84b27dc20b9579c5f7a2a3a4b2f1a4be2688cb3a
font_01_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 18192 bytes
SHA-256: 14ba90c1f237812d2dceb4e8106e002ee27a044cf4c4fa84865973e5666f387e
font_02_sfnt_off00013b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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