Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e293845d56417f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 21:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3ad1b88d4a876d407f44ce3f6ded7452 SHA-1: 71dda0651a7df4676104136b33e33a6a63c35d7b SHA-256: c9e293845d56417f663cba83f093f9e656d7283b283c90e710a72fbedff270b7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV detection, as malicious and phishing-related. It contains embedded JavaScript and numerous external links, many pointing to PDF files hosted on disposable domains, suggesting an attempt to distribute malware or conduct phishing. The presence of a visual download button and the general structure indicate a lure to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=vector+hack+mod+apk+download PDF link annotation
    • http://aftckwt.com/uploads/file/ferubofokuvas.pdfIn PDF document text
    • https://pellevah.com/upload/files/rexuma.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/10552281437.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/384655742.pdfIn PDF document text
    • https://istanajp.com/contents/files/16545517020.pdfIn PDF document text
    • http://sbmhavacilik.com/userfiles/file/kemunetawoxesuwojuko.pdfIn PDF document text
    • http://newworldss.com/uploads/file/lodirutositapi.pdfIn PDF document text
    • https://media-get.com/userfiles/files/xokunusigotififapezus.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/ribexagikevugofima.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/lokufogidesodexif.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/42878689659.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/50346733993.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/98801382005.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/39912543530.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/af76171ff1b3d0465333bed515dde268/50673626640.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/93044689648.pdfIn PDF document text
    • https://blokhol.com/upload/files/gaxipogezev.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/73439226225.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/64199338911.pdfIn PDF document text
    • http://ukrfirework.com/images/file/duxofamarijo.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/43273955477.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/70428702104.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/tajejebulolibozesuvuvim.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/35225545561.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/5607137690.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/588523151.pdfIn PDF document text
    • http://besteva.com/upload/files/79810804357.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/rutawinesejasevujamanaj.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://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_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 18472 bytes
SHA-256: 95e0e6500192f7bd4d57cdc7d283535a1801f45353ebc7026548c8ea5c6ef5e7
font_01_sfnt_off00011331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11331 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 10664 bytes
SHA-256: 7c69f4acac66c8c9139a9de7484d740f3beb80f17a523ed760ff6806c2bc3b17