Malicious PDF — malware analysis report

Static analysis result for SHA-256 04d87b3c84c84135…

MALICIOUS

PDF

79.4 KB Created: 2021-03-30 10:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 70eb3d462f9cf98a1d086d608aa32647 SHA-1: 5cba54c07c6cba47eb3c77f22317c58832c51006 SHA-256: 04d87b3c84c8413507677762e393e0b595bcc247d95d2a5c72400c77e1d2b676
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=what+order+to+read+once+series PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446151/normal_5ff5075ec80b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_6026ccf6ba845.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470698/normal_5ffe037c826cc.pdfIn PDF document text
    • http://rifeter.22web.org/best_free_puzzle_games_for_android_phones.pdfIn PDF document text
    • http://gibejujefuguxax.22web.org/business_model_canvas_poster_deutsch.pdfIn PDF document text
    • http://pisufixefonof.scienceontheweb.net/gunelutazometir.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/76480389350.pdfIn PDF document text
    • http://xedanono.iblogger.org/sap_bpc_consolidation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474206/normal_602c20e19aa7e.pdfIn PDF document text
    • http://lulodexov.scienceontheweb.net/analog_and_digital_communication_interview_questions_and_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_d6b39ce17dd042369ab5d493ade5d332.pdf?index=trueIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_591172199c2d4f638115d4f5918cd9b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/numeros_romanos_del_1_al_10000.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_900ebcd424164e4eae249b80da8c5bca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/tapudawe.pdfIn PDF document text
    • http://wafubarig.epizy.com/la_ciudad_de_las_bestias_capitulo_4_resumen.pdfIn PDF document text
    • http://miloxirabufa.epizy.com/conventional_activated_sludge_process.pdfIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_58df081312014b16b18792822f32281e.pdf?index=trueIn PDF document text
    • http://tisenunab.rf.gd/25891881905.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/xenetulorewowusoku.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/tupasidofusavageputad.pdfIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_48acc2b5663e4f4a894ae578d5245dff.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_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 5008 bytes
SHA-256: c0f34aaef65f05cdeb44d538d3be48797a286b0193c9e983cfb51d1e4ac2edcb
font_01_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 11140 bytes
SHA-256: 0c80af9b5d891f5efdfe544859d8af1295b515a4c7867e94bf9cd9908526595b