Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a698a73efe435e…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 10:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e8f927cdfc6e356bdf17968c9d73fe3e SHA-1: 5112534bed323266bffa80539600d95dce039c93 SHA-256: d4a698a73efe435e15edc1c0f7f08f6d7d9eb0c5858219b36848d1d028642912
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that function as a link farm, directing users to various disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, aiming to distribute further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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 https://nomylo.ru/uplcv?utm_term=download+excel+for+chromebook PDF link annotation
    • http://iucecb.com/files/file/kofesetuzekejimoveja.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/62469071293.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/sikadogelore.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219222316487357.pdfIn PDF document text
    • http://fgosvo.ru/files/files/41183577847.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/fafogitefukarepalewijo.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/koloj.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/56833759390.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/58183330433.pdfIn PDF document text
    • https://vleek.com/uploads/files/81944223216.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/45007425781.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/10958153847.pdfIn PDF document text
    • http://katachizu.com/img/news/files/zekixinukizasetozofiboba.pdfIn PDF document text
    • http://zeci.nl/im/image/36701830608.pdfIn PDF document text
    • https://clinicscrm.com/img/files/77784672592.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/gaduvivijuwawomiwetegigi.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/41146660118.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/8327638458.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/029048eb9defae5c14b8f37d3bb75264/7741664716.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/sojifomopebipiwemuzo.pdfIn PDF document text
    • http://8njl.com/userfiles/files/luroze.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161409a54b0a24---rufowuraneti.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/jabanukexosavurejel.pdfIn PDF document text
    • 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_off0000b0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C6 14660 bytes
SHA-256: cc6fcbca2c402151db2fd0bffdfb02354a8f568696bc98fdeb9bf09a3e0129db
font_02_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 10804 bytes
SHA-256: 0e06c3fd78e70e5d31f6a6321fd2973d9fcdbdbb209be7052d44ec88cb9a2840

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