Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a9eea088894c16…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 09:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 87a625ee56cc39d706353f4702f6ad47 SHA-1: 42dbedfac51ad024912f7c46cb1a633c028f7e31 SHA-256: f2a9eea088894c16e0737ab4c4e66823cb614442653e79dba7d228df6d9a8c31
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://wmsone.com/eimages/file/41959051322.pdf In PDF document text
    • https://riwg.in/userfiles/file/jedaxexejuzixarexazusu.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/nolufoko.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/11674960715.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/zazukatekodoxazijof.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/46613857163.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/denolufeweratulurid.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/78741234551.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/55057514739.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/98130659606.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/3386695025.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/5040832294.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/67889727530.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/fofunusikavilumup.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/pizoramarisijokari.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/ramogakubazup.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/21456544647.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/fevel.pdfIn PDF document text
    • http://ctm.it/userfiles/file/22567668744.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/81501056594.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d517370a4166399acb67e58f9671f2c8/lagekitura.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/82122043100.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/bopapofuwumoxikek.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/leluzosukidovuga.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/18000914482.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/59206916230.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/73477135110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=vidmate+app+new+version+2020+downloadPDF 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_off0000cd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE530 16408 bytes
SHA-256: 41364ac230611dca5c446cb2cb560037d6d74e77df75b6708262a352d408e44b
font_02_sfnt_off00010f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F38 10916 bytes
SHA-256: 0eeaa3e7fb3ac8a5bd8e72438ab1ec119270dfd91415dfe6af54e06406e1e867