Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f558ed982d1cf72…

MALICIOUS

PDF

83.4 KB Created: 2021-09-11 19:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c1279d498d44a16542044900b2bbda3 SHA-1: 07c934e48edeb5a516b7cae41a31f144e1e747fc SHA-256: 6f558ed982d1cf72655af9953926e588e948b992e05a7a6fd1038d87826acce4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, many pointing to PDF files hosted on various domains, suggests a link farm or redirection mechanism designed to lead the user to a malicious site. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f31cd90a98---vawagetaninujasu.pdf In PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/4941168122.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/givegizokovepetigajeno.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/vibesatetagelixanufoxok.pdfIn PDF document text
    • http://sciattella.net/images/file/xavat.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/karifosugewinorinixe.pdfIn PDF document text
    • https://slotpt2.com/contents/files/sakenerasinurazinewumed.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/46957332276.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/famuvipowi.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/14120800855.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/gewupipigevofubikexixoka.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/61018849348.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/pazas.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/sejoketajukog.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/27390565621.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/wisoserimiwalenemikaxoxaj.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/befete.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11166744434.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-4/20210904210832790864.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/lipagorexobunofo.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/soseju.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/63879570340.pdfIn PDF document text
    • https://palet-school.com/files/files/31398649354.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/69263878249.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/nakodi.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/balupujiv.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/sevejurenimutamos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tom+and+jerry+tales+the+mummyPDF 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_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 17128 bytes
SHA-256: a01df639537210de5fccf61484c1a5d63d5c3bc6de818bad3813bf0d3a7063c1
font_01_sfnt_off00010f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 10728 bytes
SHA-256: dcd58a6036f77f9fa78aece87d7307b21439f340c264d8264845712477c6503a
font_02_sfnt_off000127a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1