Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca58185c997aa77c…

MALICIOUS

PDF

86.2 KB Created: 2021-04-03 20:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ae905da0f47fa9794cc856a0fb629c6f SHA-1: 2645ea583af2ee3d43e9f8d6f89ee2fedf869a5b SHA-256: ca58185c997aa77c3ebb149a934d54b76cfb7e0b9e25360083c441475098f344
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The PDF contains numerous embedded links pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were directly extracted, the PDF structure and embedded URIs strongly indicate an attempt to redirect users to malicious content.

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
  • 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://pelibifir.ru/strik?utm_term=is+model+3+acceleration+boost+worth+it PDF link annotation
    • http://maewallace.com/supply_chain_management_certificate_programs_in_usaay3s9.pdfIn PDF document text
    • http://putoseba.iblogger.org/honda_6500_generator_for_sale_used.pdfIn PDF document text
    • http://metonufa.22web.org/atila_rey_de_los_hunos.pdfIn PDF document text
    • http://salestore.pro/golds_gym_mini_stepper_review1dopd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383924/normal_5fc677bff4151.pdfIn PDF document text
    • http://sibiwuketilivi.22web.org/19783471216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467322/normal_6051f694670d9.pdfIn PDF document text
    • http://cz-nitrof.website/823029757820ejgd.pdfIn PDF document text
    • http://vclean-sale.shop/19620138954a62t1.pdfIn PDF document text
    • http://habirovradik.ru/exerpeutic_exercise_bike_walmartzx7j9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2990ab7c-3d80-4a13-84a6-c80feb9665cd/20919594850.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/jagipepomagujimaz.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/how_to_make_an_electric_ezgo_golf_cart_faster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4dbde5-3e29-4412-965e-7a99465257ab/vezozikosutufewor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed11739b-adba-45b4-b964-3b4c18f1c0e7/5145158064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7972263f-3f13-4905-b0ce-6d97da7c7b58/66612464357.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_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 5512 bytes
SHA-256: 01e02701a9b361a57be0f6e2397bfbd6fef402af0b88e7744f1a8b3514934e6e
font_01_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 11468 bytes
SHA-256: d33086772f42cc7473320391dac04bf1b83cbf29959ebcfbd0c539bcde6fa511

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