Malicious PDF — malware analysis report

Static analysis result for SHA-256 35181b261c733455…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 11:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 934f9a37dd90c69e38d3811d9c97e6a3 SHA-1: e6d31761deb6071701f2e51b7c24a2acc8349ceb SHA-256: 35181b261c73345528d659f54d63360715c2f33711b41f0df7a8d8cdb4e55a38
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=ship+battle+mod+apk PDF link annotation
    • https://rachelrom.com/rescontent/file/3409628794.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/31021161369.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/78894485363.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/39257273731.pdfIn PDF document text
    • https://htchninc.com/d/files/vagep.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/64398358120.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/kazofuluzexo.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/rugofasepezinibesov.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/zozitufatidajosupu.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/13093619967.pdfIn PDF document text
    • https://esz.jp/img/editor/files/xudekuro.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/julojiporimus.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/95279653459.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210906_3BF0C837B54742DE.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/28769301813.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/rusisomukuxedarinidup.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142bfa8cafd4---92091843690.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/90651663768.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/zejef.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/43331945799.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/31878485140.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/99915710022.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_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 18296 bytes
SHA-256: d92ffe4502c9feb43154dd04eb1be29b1441748152752d6094bf34bcb5272e11
font_01_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 10592 bytes
SHA-256: d435936f4d3e0f62c739ffb6d60471f23df5da0ef3bcb344c4064afc89773b53
font_02_sfnt_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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