Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a5c27b683f5829…

MALICIOUS

PDF

79.0 KB Created: 2021-01-26 04:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 11f16d765a3cf8040230dfb8752e5f46 SHA-1: 3be53629520c83167bc61934559415d43e4b011c SHA-256: 37a5c27b683f58290a0e2644a72ede391b49e6ceca347966094da8a7802086f0
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The document contains numerous embedded links, many pointing to disposable domains or link farms, suggesting an attempt to distribute malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/wb?keyword=mega%20jump%20trampoline%20park%20doral%20prices In PDF document text
    • https://sizuwebon.weebly.com/uploads/1/3/0/8/130814729/214ca76b4903.pdfIn PDF document text
    • https://laratenin.weebly.com/uploads/1/3/2/8/132816160/matuxal.pdfIn PDF document text
    • https://zewemoledomuro.weebly.com/uploads/1/3/4/7/134746436/gufakiwabiz.pdfIn PDF document text
    • http://hurricane1.space/4914149213b6qs2.pdfIn PDF document text
    • http://instas.site/lawiz94n4y.pdfIn PDF document text
    • http://lobarularexe.iblogger.org/adobe_after_effects_cs4_templates_free_projects.pdfIn PDF document text
    • http://fasad-dom.site/653844657979ofte.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zerakunutage.epizy.com/radutebewawukoguso.pdfIn PDF document text
    • http://puguvapalovuzub.rf.gd/health_related_physical_fitness_test.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/interrogative_pronouns_french_worksheet.pdfIn PDF document text
    • http://pibekolovaxizon.epizy.com/2654936781.pdfIn PDF document text
    • http://nejowubixulifud.rf.gd/chevy_cruze_eco_2012_manual.pdfIn PDF document text
    • http://kugefosames.rf.gd/congenital_cmv_infection_guidelines.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://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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 5420 bytes
SHA-256: 8846ff70e0077dfbc2f1a3d9d10768f7db0d3797ee424b27e975dd2f19f3d3bf
font_01_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 10740 bytes
SHA-256: 961616a12451b186ac12253cfd0ccbde546924c7b27bfec8f67aca0bf97fbcab
font_02_sfnt_off00010b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B45 16288 bytes
SHA-256: dee2f77b05b88ee2f3c02cd20bad1a34d21e34a153f6dc90e892ebdae2fdb631
font_03_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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