Malicious PDF — malware analysis report

Static analysis result for SHA-256 3289903cbe77f03f…

MALICIOUS

PDF

88.0 KB Created: 2021-03-20 08:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 48ac3d11465ba08a7c45ed222d44fbe8 SHA-1: 7f73fc633e4e9beffdae0b053563ca4e2f54e4fd SHA-256: 3289903cbe77f03ff986bbd3e9114dee3531ad3b5602142bfd9174ce926000f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of disposable hosting and link farming tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=gigabyte+ga-x58a-ud3r+drivers+download PDF link annotation
    • http://xutefizil.getenjoyment.net/fedobasokafekijox.pdfIn PDF document text
    • https://cdn.sqhk.co/sodelaranu/bhaiiPa/the_cheap_detective_movie_cast.pdfIn PDF document text
    • http://masito.space/saxozotagazokolikozuvipklmr8.pdfIn PDF document text
    • http://wunadimizurened.medianewsonline.com/fabixatex.pdfIn PDF document text
    • http://help-bluebadgecenter.com/73584681524a20d4.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/ashjjaj/32174819521.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuvegox/cigJ0jb/huawei_p30_camera.pdfIn PDF document text
    • http://nupewijanetari.medianewsonline.com/bright_starts_automatic_bouncer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/6904956025.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/what_type_of_room_heater_is_best.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/cover_letter_templates_for_online_applications.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/bronx_masquerade_book_pages.pdfIn PDF document text
    • https://48bd7725-9370-4d18-884e-e75d7b70c9c4.filesusr.com/ugd/f241d9_420114beb11f4d28a6ddfba2edd46047.pdf?index=trueIn PDF document text
    • https://2ed9768e-82a7-41f7-bc91-4b86d8d7aa0f.filesusr.com/ugd/bdbd91_1355231f50c241e3b581fe615556e50b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukusa/9328551645.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/7179493922.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_d8e6a7f029c4481c97c58e1563bf3136.pdf?index=trueIn 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://scripts.sil.org/OFLIn 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_off000102aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AA 6000 bytes
SHA-256: 4d8ce82a32e5f987520be91835a028edffbb7115f75b98c7da0d43b9b9949837
font_01_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 10996 bytes
SHA-256: a8e68a9eac762177cd0c94e8053b4dade154908c1aa8fab76fd8941a8995273d
font_02_sfnt_off00013d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D06 16260 bytes
SHA-256: 16d3f8655114d0902318f1a45715520560773d3bf5e390d74f207be828cb3ad7

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