Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd08b4b5c13a15c…

MALICIOUS

PDF

80.4 KB Created: 2021-03-11 08:37:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e41b1703d1abee086f7909f4ebf36f9b SHA-1: 5249d3b71d477a2cab8c06bf2bf356dd9b1ab26b SHA-256: 5fd08b4b5c13a15c09806c595a66d7885be63a1bb52105cb7c2446571d36e860
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/award?keyword=biometric+based+attendance+system+pdf PDF link annotation
    • http://pekefosijemibi.sportsontheweb.net/how_to_use_my_black_and_decker_drill.pdfIn PDF document text
    • http://sexekovowo.iblogger.org/how_to_deal_with_emotionally_unavailable_mother.pdfIn PDF document text
    • http://pakewiw.iblogger.org/9966105023.pdfIn PDF document text
    • http://vufilulojusabid.iblogger.org/mod_skin_dota_2_full_arcana.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/ad0ec8e4-d604-463e-a6a2-4dfe3567e9e6/how_many_amps_does_a_dometic_13500_btu_air_conditioner.pdfIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_6395b69567a64579b32571c03be789ae.pdf?index=trueIn PDF document text
    • http://zegapoja.epizy.com/farmacos_antagonistas_muscarinicos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a6ef7a8-f720-4523-a08e-8561e4ffbd7a/just_2_words.pdfIn PDF document text
    • https://f414df59-d0c5-412c-8277-160bd92acc6e.filesusr.com/ugd/055bb3_77ccdb8ca7ff407395c1a59eb70ead21.pdf?index=trueIn PDF document text
    • http://dovanokeji.epizy.com/rozuvilivakonig.pdfIn PDF document text
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_be3cc3bd00d44157b7310856ac0a8ef2.pdf?index=trueIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_5e0ed4cf11924f3e9ad17c487479b96f.pdf?index=trueIn PDF document text
    • http://xovogig.epizy.com/69584858679.pdfIn PDF document text
    • http://pujusojup.epizy.com/sample_meeting_agenda_format_printable.pdfIn PDF document text
    • http://xusapibu.onlinewebshop.net/functional_training_exercises_for_beginners.pdfIn PDF document text
    • https://f3dcd8e3-6656-4b47-a81e-a993d3c4f2a1.filesusr.com/ugd/aa9ef2_6ad28c0355fb4e26bdf126004150df18.pdf?index=trueIn PDF document text
    • http://mifetominugumow.epizy.com/what_books_are_similar_to_the_maze_runner.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/matlab_for_loop_matrix_elements.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_905afaa76c1a45e085cb8c6debe8f391.pdf?index=trueIn PDF document text
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_f9b3890b775a4375a95fd7573851d7ea.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_734370f60840483392325a57b361a4a8.pdf?index=trueIn PDF document text
    • http://legopabez.rf.gd/76790566220.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_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 5560 bytes
SHA-256: 52ad8ee36d07ba7e3c51258fd0469c7bdda1fb81ad755e01ba65557aa0e9b04a
font_01_sfnt_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 15148 bytes
SHA-256: c9bc85bb2af67a632e81156940bda3f38c869d917366523f64864e9068e7b54d