Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b658ca1c0e099a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 11:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0f9ec756001b1f06380a8b456ce9f05a SHA-1: fcbc2662a4ee1b0bb9d35d16f46138167774d584 SHA-256: 95b658ca1c0e099aaf7b8a9a8cfcc0177f0720edc995304637b411916b5960c5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, a common technique for executing malicious code within PDFs. The PDF also includes numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The embedded JavaScript likely redirects the user to one of these external sites, which could host further malicious content or phishing forms.

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 http://jshtextile.com/UserFiles/file///46872143663.pdf In PDF document text
    • https://shevtsov-art.com/uploads/files/gadazakuw.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/15820187260.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901055943574242.pdfIn PDF document text
    • http://nemalipics.com/nikatutogit.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/futawixofusitijapitoda.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/kupivofurabuwupejam.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/dewam.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jilulalevofa.pdfIn PDF document text
    • https://kawanmto.info/contents/files/maguduvabajutixewolidap.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210906075338220429kuvgmg.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8e9508ea0---70024764748.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/butomemumazamaje.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/toxafux.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/miruxelenovumonapuvovoz.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/tubirimesebagefawanipo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nirenuwa.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/nuzulomerawopuzukuliw.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/fewebenen.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/liloraginoxixusew.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/26632666120.pdfIn PDF document text
    • http://staropolski.net/Upload/file/suxutokuniwe.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/gimewubosetawakufegeruni.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/49755625114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=run+3+no+flashPDF 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_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 17672 bytes
SHA-256: be68d82e3ffb4ee0f27a9266e49f9f0a13be7d0f690366ea38beca9f2720aa42
font_01_sfnt_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001252b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252B 10208 bytes
SHA-256: 8f2557f7ed66f613225c3fd3edae83b212b73ee195db919bee4a05c0a65081b5