Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e272fc14ff88e9…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 23:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e72cb18b0564c65b39e0cf0823d0d47f SHA-1: e27bd29e91309ecbf2a79bbaa72379c375ae948a SHA-256: c9e272fc14ff88e9f592f6d70be2b2532c649d9da9cdc0a0170a483f654a1c3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to link farms, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for a large number of links, further supporting this assessment. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://ct-tci.com/cttax/userfiles/files/16187964532.pdf In PDF document text
    • http://gidromall.ru/img/uploads/file/23174424957.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6470b2177---fonuwutesuneguvawe.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/nunigezunase.pdfIn PDF document text
    • http://ndt-ultratech.com/files/98061256498.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/xexezexoluvuved.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/dekano.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/1890546494.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/laposufakomidixofagonat.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/valimedivir.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/42kck7k8004o0o6dioam9h41da/wiroluxiwilepijobo.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/40846384098.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/sixemujozerukudinoxogowa.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/65799424330.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/xaxokimarukagowi.pdfIn PDF document text
    • http://gardatrans.com/content/Files/84983325339.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/lamunerunomomonekaviwus.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/penajarubafexon.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/88395497627.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/58444728380.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/rukakamabokikopus.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/77079905790.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/webomatodarapovatoritad.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/bitotikusomelitanotegerag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cat+talking+game+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_off0000d26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 10532 bytes
SHA-256: c1cba3967defbc80ab6866b309095faa9e1330a44a54673838d7bf9997a1e002
font_02_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 16720 bytes
SHA-256: 1bd0cf4ddf67f7babecce7c95882b1c366269fb45ec2bf46f6ad04fbe6df99ab

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