Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a34ba31fe17f1a…

MALICIOUS

PDF

73.4 KB Created: 2021-09-12 06:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7bc70651f442c5172aaeb4b1f6d42e3a SHA-1: 05a0b3b62425b72fc97bceaddda0b46d46de5038 SHA-256: 99a34ba31fe17f1a3c5422e240b429326257b028b323e4bc334b6e46cbfebf9c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to potentially disposable domains, indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support a malicious classification. The document's structure and heuristics suggest it's designed to redirect users to malicious content.

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://autosoftware.company/autoresponders_images/files/fubekujekanuzatevepo.pdf In PDF document text
    • http://dealershop.es/userfiles/file/gepatemi.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/58475619383.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/81426892039.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/xalatomanatawufi.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/nifipesetuzobepose.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/wosexegilepaburewidoxiduf.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109111721284946.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109030820066884.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d56c77247e---83784754812.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bab279b53b---43208538276.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/tutaboparesiwu.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/91091307017.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/gufoborewuruxidumowemojor.pdfIn PDF document text
    • http://devveb.net/userfiles/file/27067577517.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/45490438761.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/85352547957.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/damuxodaxuz.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/lozovubobuxosowu.pdfIn PDF document text
    • https://sanidom.pl/img/file/gujilofuxataxadesulipivuz.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/45379492071.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/69578292726.pdfIn PDF document text
    • https://prettygreekvillas.com/admin/fckeditor/editor/filemanager/connectofile/39648358786.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/95600704733.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/lusepef.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/kajovajofibadarugifom.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/7515922501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=fundamentals+of+corporate+finance+8th+edition+pdfPDF 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_off0000bbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDE 11172 bytes
SHA-256: 4ca9d98895b14f5c7e7072e18be20a47beebad7246d157277fe1c9fc69a59857
font_01_sfnt_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 16424 bytes
SHA-256: 7851ea2433d1983f811b39666986d99a1bf2e377bedc7ab3f7b7d10fe6addf3a
font_02_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1