Malicious PDF — malware analysis report

Static analysis result for SHA-256 6585cacdeb65ba4e…

MALICIOUS

PDF

85.2 KB Created: 2021-05-07 04:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bb156b5e58d5dd94ca674d56f3d753ea SHA-1: b83fb922d325d48e3ac10db97e37bcb8450a9f9b SHA-256: 6585cacdeb65ba4e66201d2c6a0f991a52a7cd15476baff3fc43b88331d9688f
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 0.9998

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://kuzutuzo.ru/strik?utm_term=ryobi+2+cycle+gas+backpack+blower+reviews PDF link annotation
    • http://relax35.ru/when_was_samsung_galaxy_note_4_released5iv06.pdfIn PDF document text
    • http://cybety.xyz/the_vampire_diaries_season_8_episode_13_themagictv39uny.pdfIn PDF document text
    • http://datab.vip/pezemiwzlce.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://byt-upak.ru/how_to_learn_hindi_in_30_days_through_kannadar5nlo.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/22791516659.pdfIn PDF document text
    • http://betflixguvenilirmi.com/40355857225ge40v.pdfIn PDF document text
    • http://myimperfectmomlife.com/molenavijidbddjl.pdfIn PDF document text
    • http://phtech.site/785386027264udfa.pdfIn PDF document text
    • http://sportplays.ru/xanafeluvewifazozebenureblo8mb.pdfIn PDF document text
    • http://gebevojika.mygamesonline.org/pdf_to_ms_word_converter_online_free_without_email.pdfIn PDF document text
    • http://tacfitproducts.com/60360727873d3y11.pdfIn PDF document text
    • http://vigastlens.xyz/591220481096xps9.pdfIn PDF document text
    • http://tafiwon.mywebcommunity.org/puzufenopuvonidulapinan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30b7a97f-6117-4fff-8876-4b3c2220b6c6.filesusr.com/ugd/15cd4d_cf79feda917448d29c8475e2887fd7b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/airac_1703_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/81578676652.pdfIn PDF document text
    • https://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_7008ff0f783442ea99e69fc80bcba453.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/breakup_whatsapp_status_video_female_version.pdfIn PDF document text
    • http://fuvarijes.atwebpages.com/45211061044.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_off00010e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E14 5696 bytes
SHA-256: 5203f7f81360ce7b33f842706e00ad0c6538e3a5ab609dbb21956e2f13a539b3
font_01_sfnt_off000121b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B7 11164 bytes
SHA-256: e25271b61394e4c153b1f31e3131e5d0c571a86f26f69fb66fe54a43c9ee2bae

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