Malicious PDF — malware analysis report

Static analysis result for SHA-256 966350e85d12b5c6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 20:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 773a3fb8ab63bfc0b8ef50fa9e24dbd8 SHA-1: 946b405ea2c22276b2a0a8bd0b187153271409c7 SHA-256: 966350e85d12b5c6c3be4d07fa7ba612f6ad1e01c57577941ab60a53640f964f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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 https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b1c74bc9a7787a1c670b42042fe5fa55/38708417771.pdf In PDF document text
    • http://ud2-140.com/files/42350863566.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/gogidagatalobodu.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/bukotibaxawasixubejalar.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210909_172617.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/37946069193.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/ximekunijutewetuxelefok.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/52069091265.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/12566584190.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/90368801798.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/48492227635.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/loviparopi.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/kajizutizo.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/09102110820.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/dizowaxabogojewunasu.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/wurirofiwezagegox.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e591c30a---82435840202.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/xilonamokedoj.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/95545736459.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/kidufuxapodamowo.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/31133427825.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/7015996171.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/xowuvabosagavowil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=hill+climb+racing+2+hack+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA18 23480 bytes
SHA-256: b13aefb1a919339030144fd67428f268991688d084093fb2514cb887899854a4
font_01_sfnt_off000105c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_03_sfnt_off00012660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12660 10848 bytes
SHA-256: 62af13c51db37e1a0e45fb49aac131f965a01202f60c166f7d05958226681822