Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8facbc4fe178851…

MALICIOUS

PDF

76.5 KB Created: 2021-03-14 02:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5163d4da84f3ed0e11a0fcd1061a682f SHA-1: b73a2d9b65fbde52f0eefb12c24156e65714c6e6 SHA-256: d8facbc4fe178851620027166d69c4e54236b50e9bac25a2dbb1814ba92b65ce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to link farms hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=mario+combat+2+unblocked
    • https://cdn-cms.f-static.net/uploads/4452845/normal_5fd9f3a8af818.pdf
    • https://cdn.sqhk.co/jimevexir/MqvFjcf/62366600570.pdf
    • https://cdn.sqhk.co/leperanurosi/iggfCTi/98249288283.pdf
    • https://cdn-cms.f-static.net/uploads/4491436/normal_5fd2e83970854.pdf
    • https://static.s123-cdn-static.com/uploads/4386330/normal_5ffaa28d7bc75.pdf
    • https://static.s123-cdn-static.com/uploads/4481993/normal_5fdf1daa19924.pdf
    • https://static.s123-cdn-static.com/uploads/4479942/normal_5fcea1be2eaba.pdf
    • http://kegolij.iblogger.org/honda_em5000_generator.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xifabilejilab/funny_movies_on_amazon_prime_right_now.pdf
    • http://jozadedosirokeb.rf.gd/star_trek_movies_in_order_jj_abrams.pdf
    • https://uploads.strikinglycdn.com/files/64f44946-2e64-4b1d-bd82-495b28ec2999/80844756549.pdf
    • https://uploads.strikinglycdn.com/files/d8d86617-5d98-4936-852a-6cd2e9825ea0/what_comes_after_insurgent_in_the_divergent_series.pdf
    • https://s3.amazonaws.com/limepusotanal/how_to_clean_a_sunbeam_warm_mist_humidifier.pdf
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_4d97fbe61ba147baa935577d5479e657.pdf?index=true
    • https://s3.amazonaws.com/woxorojero/antonio_gramsci_hegemony_essay.pdf
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_9db6a5fcfc614a16965bec41a265d664.pdf?index=true
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_9e285136315a45a680b582e8126e9523.pdf?index=true
    • http://wigexoli.rf.gd/blades_in_the_dark_espaol.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e517.bin
2fe06b8946c60f8133b2569688e1f8ef142018f6d7c8aa35299ba7ecd3b99c9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 5248 bytes
font_01_sfnt_off0000f6e1.bin
c7f460f4b0c85be2b609734d7e7173594ed87f8cec3555a2490987ecc224c124		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 13892 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.