Malicious PDF — malware analysis report

Static analysis result for SHA-256 c084f185be2b7169…

MALICIOUS

PDF

75.3 KB Created: 2021-03-04 18:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ef95f81247d169a0643b641ffe871503 SHA-1: b6503e4f1f87401e76dfc2071351b70638f681d2 SHA-256: c084f185be2b7169679f85d1a3d23b77d74521b230059bba0a26ac2ae661e2eb
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous links, including those on disposable hosting, suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=plantronics+voyager+legend+charger+walmart In PDF document text
    • http://fakixigulidol.mywebcommunity.org/40860054098.pdfIn PDF document text
    • http://dizititakozazi.mywebcommunity.org/67365840561.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/dexter_commercial_washing_machines_for_sale.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/new_twilight_movie_midnight_sun_cast.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/de_que_se_trata_la_obra_cien_aos_de_soledad_resumen.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/munatunetejipoxared.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377924/normal_601ef4febe557.pdfIn PDF document text
    • http://kadesevi.iblogger.org/fiwuvu.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/oldways_mediterranean_diet_brochure.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://negakibuteno.epizy.com/logic_10.4.8_requirements.pdfIn PDF document text
    • http://mamisiz.rf.gd/nikufinuxedik.pdfIn PDF document text
    • http://bopadem.rf.gd/interior_designer_near_me_uk.pdfIn PDF document text
    • http://kebugitop.epizy.com/how_to_build_business_credit_fast.pdfIn PDF document text
    • http://xumugipetoje.epizy.com/26174678039.pdfIn PDF document text
    • http://gurebuvijo.epizy.com/7869989322.pdfIn PDF document text
    • http://vexolofifete.atwebpages.com/girodadi.pdfIn PDF document text
    • http://nopawalaxuwaw.onlinewebshop.net/portrait_of_king_james_1745.pdfIn PDF document text
    • http://gototura.myartsonline.com/why_list_your_company_on_stock_exchange.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 5608 bytes
SHA-256: 7548fc953334768157694be5bd48f9f01910631ebd6da2defa8cbdf0da02845c
font_01_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 11284 bytes
SHA-256: 883acb7391a57c37c64245e69f7c4b6cc5db5978b52db6b842a01e7fb40e8a61

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