Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b618d5a6d17375…

MALICIOUS

PDF

69.8 KB Created: 2021-09-28 22:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ad23d489b60c8360aba6fc643ae9460c SHA-1: efadecad0c8a5608b769e3068eedb64eafa8a4b6 SHA-256: b8b618d5a6d17375185036501b0b0d4b708c4d031ea17b325b92e5960518f6a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=human+evolution+simulator+codes+roblox PDF link annotation
    • https://casartigianiudine.busletter.it/ckfinder/userfiles/files/90201543086.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/tobujirivarorovuta.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/bisukat.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/50425707356.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/4b9928be342eb5c55e9f104bd47a0985/wosekikubagirulurewu.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/15075917831.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/katevisefetabegomozijan.pdfIn PDF document text
    • http://briztravel.com/upload/files/wojolaxesorefitixaza.pdfIn PDF document text
    • https://mimpishio.com/contents/files/38807974471.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/51834368989.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/3601236782.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/sazasigugipov.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210926031621.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/31552771043.pdfIn PDF document text
    • https://webrobogo.hu/kepek/pebudifoxatidubuwadilidul.pdfIn PDF document text
    • http://fitviewer.info/files/file/mopakesetenojix.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/figipisezimow.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/71783214367.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/19/file/20210919_123801_190.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/34529464122.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdc5bccdea---mirowojan.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/xopudoz.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/24517060853.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_off0000b119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 10928 bytes
SHA-256: 4a7f9d3e07c814ea8f5d9d4783f45bf3d380110ab421a9dd7b0f4325afa28f1c
font_01_sfnt_off0000ca67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 15456 bytes
SHA-256: 9b9bbf855e8d0385a4f641aa1ee7c43b8a8e4abbf7eb4a29d7586728f36d0a8a

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