Malicious PDF — malware analysis report

Static analysis result for SHA-256 305796b52ff42a63…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 14:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68598dadd8a2dab9de50a67ccb9f9161 SHA-1: 26f0edec95c1a334fc307a5c755938bcf2d0a9c7 SHA-256: 305796b52ff42a63d6ea942098d4f5270e708a9b67a23dd741b9af76da5b7dc1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the execution of JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=snaptube+song+downloader PDF link annotation
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/jp06cthd4bc7uleigeej8loob7/34510582936.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109171546028704.pdfIn PDF document text
    • https://lsv-wittlage.de/ckfinder/userfiles/files/bexewo.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/94998583760.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/10160195686.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/64951529381.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/41573453559.pdfIn PDF document text
    • https://ripedesign.com/app/webroot/files/fckeditor/file/52571291149.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/1508593852614542546d3a8.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/36791912870.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/rivivavadig.pdfIn PDF document text
    • http://floramarble.com/uploads/dixowipa.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/lovubotu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16145a8622115a---17458171594.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/94643629720.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/gobimavuxuzosuliroj.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/17562859364.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/joputizel.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/tivegusegubivoneli.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/57114931682.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/kerexofijaw.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/nawimowisigawisen.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/barabodiziwiwamopepud.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_off0000b969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB969 15636 bytes
SHA-256: 7b7950de8d7525b0cc66dad213f4eb4994de8e6c3e4fb83c8f92d457a5d3cdb8
font_01_sfnt_off0000e149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 10876 bytes
SHA-256: 3eff8efadb05e9224436b0085a65aef27205732efc27a3e4856ed8d7873b9f08
font_02_sfnt_off0000fa36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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