Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb1b8d02ef35cba…

MALICIOUS

PDF

82.3 KB Created: 2021-09-23 14:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 228a70986364a1f21a5364f81ece0c85 SHA-1: 68f59dc80b0ec1796f3e52ae1e47693e460a7424 SHA-256: 4eb1b8d02ef35cba40802e86110ea648862520f08786c22c65e48c614ef82719
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external URIs, many pointing to disposable domains, indicating a potential link farm or redirection scheme designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infinivideo.hu/sites/infinivideo/files/bilazavar.pdf In PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/94108730157.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/sibezefepu.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/50800822139.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/0d54d047b8c8176815c7c30d8193c84a/87147461171.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/32510657396.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/dumadas.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/tarosatanixubolalekotog.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/8767eb6147aece779d36f82b381c0e29/kekunet.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/79747404292.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/jumetaxivudetoremaf.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/4298813797.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/90351719343.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/92854434498.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/lokapidelisalij.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/sedeketosuzidusuguzavomus.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/40484429087.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/79070452609.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/pibefiramonidoxixireporib.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/31444186420.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/88091580745.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/fegeluvosemonifutetukax.pdfIn PDF document text
    • https://agrando.cz/files/file/zaxuvoxosiwo.pdfIn PDF document text
    • http://sun-tes.ru/files/file/66114238494.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/zudotagudonutikanosupez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=one+click+apk+installerPDF 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_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 10364 bytes
SHA-256: e8a88064be83ae2a6484570e12f8425877e46378eb56f2854415fceedd483c4d
font_02_sfnt_off00010979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10979 19184 bytes
SHA-256: de65707b39f8080b7a6df803c16b4f9ee062014914d944fdbd5d75623ddac2ac