Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b503d461eb173f9…

MALICIOUS

PDF

104.2 KB Created: 2021-03-28 16:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ec0e43aaa9b086cbe793bb810d26a948 SHA-1: ecad00fc96e2afadacdd42a0fb3507428df8318d SHA-256: 3b503d461eb173f909d8fa55f7f65f035c08eaa0343db472b9aaa3e706405cfb
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure related to 'essential oils' and stress relief, likely intended to trick users into clicking malicious links. The presence of multiple links on disposable hosting further supports a phishing or scamming intent.

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
  • 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://yafferge.ru/strik?utm_term=what+essential+oils+help+relieve+stress In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_603f18ea78299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384026/normal_601f7dd5df19a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_60401eb5508c8.pdfIn PDF document text
    • http://lumoxul.iblogger.org/47029995162.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vakabivemu.epizy.com/ad_campaign_plan_template.pdfIn PDF document text
    • http://numaripokusuj.rf.gd/former_real_madrid_castilla_players.pdfIn PDF document text
    • http://fuvuvadut.onlinewebshop.net/98219392480.pdfIn PDF document text
    • http://naburonip.myartsonline.com/jamaxagekadaxamufikabuka.pdfIn PDF document text
    • http://vukotirigepiv.epizy.com/8483091856.pdfIn PDF document text
    • http://sijikipemed.rf.gd/kenexa_prove_it_excel_answers.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_f9fbbfec390345808366c7ae54059514.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_49b2e1db231a48bcb582d6b646ff9509.pdf?index=trueIn PDF document text
    • http://gedesopow.rf.gd/baron_trump_book.pdfIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_8d2654bb7cda44f6aec90a0e37428d04.pdf?index=trueIn PDF document text
    • http://gevitejivojo.rf.gd/andressa_urach_livro.pdfIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_781ce6c528ce44c8835942a14d17144b.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC2 4980 bytes
SHA-256: a4a9b93f49e78d11f489e655cbe9a0897e695546ffb507dd1278a2d67e8752c9
font_01_sfnt_off00016bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB8 11740 bytes
SHA-256: a78207c6ca1c31b2985cd85af784eadcf910dc7498613f2edb554bee4656c300

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