Malicious PDF — malware analysis report

Static analysis result for SHA-256 5084412a820a9d27…

MALICIOUS

PDF

78.1 KB Created: 2021-04-03 05:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 39e52818bf03697a90f0d0cc7cbc65a4 SHA-1: 1ca7e8ffec9897e14af7aad365e4ca6dce0ff648 SHA-256: 5084412a820a9d27ad9d735921178dc354bf2c3ece06951aaacf85c9d8676730
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 0.9992

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://gimoguvi.ru/award?keyword=calendario+2020+con+festivit%25C3%25A0+da+stampare+pdf PDF link annotation
    • https://cdn.sqhk.co/foroboreb/eieHIgc/gemafapugo.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/89781574602.pdfIn PDF document text
    • http://rubeatyshop.xyz/the_rising_of_the_shield_hero_light_novel_english_translationlj6t4.pdfIn PDF document text
    • http://bestcreditcheck.info/does_oxiclean_work_on_dog_urinexqdqk.pdfIn PDF document text
    • http://uaregroup.com/book_destinies_of_the_soul1gvbi.pdfIn PDF document text
    • http://goldenframecollision.com/vijenocp02s.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/1hfSdoM/high_uncertainty_avoidance_culture_examples.pdfIn PDF document text
    • http://zanartcc.net/how_to_download_cydia_without_computer3p4yv.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/recognizing_race_and_ethnicity.pdfIn PDF document text
    • http://leseweremizew.scienceontheweb.net/jodofavazuxodevupa.pdfIn PDF document text
    • http://item-get.top/zujumazirigeni9h4sg.pdfIn PDF document text
    • https://cdn.sqhk.co/situdejoj/fuibojc/program_coordinator_job_description_non_profit.pdfIn PDF document text
    • http://lavka-karamel.ru/wobusarogorupeluvipezijtdpch.pdfIn PDF document text
    • https://cdn.sqhk.co/maweveju/iZc4giN/define_psychology_of_education.pdfIn PDF document text
    • http://persequenteamsohbet.com/84733997983u3c69.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/Qjdhija/marketplace_cars_and_trucks_by_owner.pdfIn PDF document text
    • http://tarigutese.mygamesonline.org/modern_brazilian_portuguese_grammar_workbook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_b8ce66f71123491c97c1c8ec691082cb.pdf?index=trueIn PDF document text
    • http://kofaxafogi.myartsonline.com/how_to_calculate_kva_for_3_phase_generator.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_14f6cf2ab96d4582a048f5f0bf8cca70.pdf?index=trueIn PDF document text
    • https://b615eccc-4413-4b1d-8109-ede925130a83.filesusr.com/ugd/0994f9_29e7da1f31b84ab48e6fda256826e2af.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_0fc0c1c9db6844f49e43d3977e4dc65d.pdf?index=trueIn PDF document text
    • http://segurixuzek.myartsonline.com/nelutitosunog.pdfIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_528eb0c73aab44acbbd9312d6096c97d.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_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 5776 bytes
SHA-256: 6a6fab960e2696717fe35605943e5f806cac18ca3cf90eb778ab0c6c7d1bfe6e
font_01_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 11384 bytes
SHA-256: d19094b3575cadb7db4869693f744484e84bebab2345dbe20f5b6ecae99b9c2f