Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c9c1a495ce6c0a…

MALICIOUS

PDF

72.6 KB Created: 2021-09-28 18:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84244495806ced53c271720ab9c1fe6a SHA-1: 55897a9e1fdc8b88a4806508e124525a0093c68b SHA-256: b6c9c1a495ce6c0ada7d8e8b38889e7003f4145650320c6c6daa629a06207b6b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high number of distinct hosts and a pattern consistent with SEO abuse for traffic generation or malware distribution. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 4

  • 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://villapellegrino.it/userfiles/files/deteletetekotefibeguf.pdf In PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/86140107666.pdfIn PDF document text
    • http://teknis.it/userfiles/files/72064891197.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/73510186777.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/loxato.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/45938601541.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/riromisewafawoxesipa.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/mawurogubamekozavame.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/66331955938.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/kadaxizadozibupal.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/35014607778.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/muredizajigufenipekovo.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/71022992931.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/ef9f2b9611a3193a59315622d9346143/27961831876.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/xezenisabujare.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/suvonekisuka.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/88220942367.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210906_B8D2AB07E5384362.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83908534170.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/90791940808.pdfIn PDF document text
    • http://wallbedsindia.com/uploads/4387091169.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/20929649558.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/9038008747.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/xabemukixotarukisuteve.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/xonoragidavegufuwiwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=opn+sports+live+apkPDF 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_off0000b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB633 10428 bytes
SHA-256: 4358159d12e874b47ab42073fa6e30dcb261ea230334de301e997821f37745f5
font_01_sfnt_off0000cdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFC 18140 bytes
SHA-256: d924d69f920924d7075258ad3129002cd4c5d9b2253a0bc0be8fd4f525b26626
font_02_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1