Malicious PDF — malware analysis report

Static analysis result for SHA-256 1959a1cdc3900102…

MALICIOUS

PDF

78.6 KB Created: 2021-09-20 14:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98fef45aa3c2aa27c242c1b6b7070e06 SHA-1: 035e88d3a216197f5c5f9355b7ee43970cb3218e SHA-256: 1959a1cdc3900102d90c6513649c749833e9c9a51dc5943763e6bbc2d52aee36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of embedded URIs suggests an attempt to redirect the user to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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=robbery+bob+2+mod+apk+android+1+com PDF link annotation
    • http://aquaclub.hu/userfiles/file/modumaradupuwu.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/84483873928.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/bukamowojonaxom.pdfIn PDF document text
    • https://redac.ch/upload/lebelovabo.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/motigakalajix.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/44920423097.pdfIn PDF document text
    • http://cke.hk/userfiles/piropugelulifujovud.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/38472828683.pdfIn PDF document text
    • http://recit-de-vie.fr/userfiles/file/mufenoxenuxuvoligelexa.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/93618818473.pdfIn PDF document text
    • http://teakdeck.pl/files/file/legogute.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/17615898064.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/67231147151.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/tirosiborixesuwirogamub.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/41320678798.pdfIn PDF document text
    • http://jfe.hk/userfiles/23340429630.pdfIn PDF document text
    • http://4bx.pl/public/file/21522277177.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/70780762327.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/vodofukonenumamalipik.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/eii8cdc32nr0r0e5ss50hioc4h/82171012794.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/23960534398.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/10682925668.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/dokini.pdfIn PDF document text
    • https://matrixx.lu/images/75725484894.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/3563764611.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/61963602216.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_off0000ca50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA50 10928 bytes
SHA-256: 81a4f029d35e06615c5e59f516932d4d475a8cb01d740178cc3ecf68caa7c974
font_01_sfnt_off0000e379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE379 19088 bytes
SHA-256: 8b9920298b8fb113a4b52d82106cd0e66799461c85c2aa0802ce0a9607005f2e
font_02_sfnt_off000114ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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