Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7d59d1e9155130…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 14:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a5e18f3cda308a996c5abf923433e52 SHA-1: 158b61671b3dadca0ece6f1047a6c309c914f151 SHA-256: dd7d59d1e91551308b519540b50a8cae802d3931262582775371437311fbc05c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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.
  • 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://garglob.ru/uplcv?utm_term=stephen+sharer+rocket+slide+app PDF link annotation
    • https://classykitchen.pl/web/uploads/files/55979528269.pdfIn PDF document text
    • http://dd-eng.com/files/files/vugivafetuz.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2f2819aaa9e279da9bb5ad3fefd927c0/41660409196.pdfIn PDF document text
    • https://clove7.com/userfiles/file/48677759232.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d882fbf897---vivozazemadewuzinebopuni.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/81339548628.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/domopasug.pdfIn PDF document text
    • http://bamila.vn/luutru/files/voliwenotevuwinimaba.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/32253342414.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/losezom.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/lawilurejisizo.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/6258331321.pdfIn PDF document text
    • https://naves.cz/res/file/norimeponobipitititu.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/sejod.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/678255843.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/85025593461.pdfIn PDF document text
    • http://yjccnc.com/upload/files/33665359388.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/zelositasagotekofu.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/kerisodopojemekip.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/moxegazamonorex.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/limuwipipazege.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_off0000ad39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD39 10776 bytes
SHA-256: eb9255a35f8ef6029d6774c4956572a58880505bc10d255be18e8d2826ab78e5
font_01_sfnt_off0000c5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 16940 bytes
SHA-256: db722fa2b550a872e381a76243c095e2db5b2e6939c584701426228bf3caccb3

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