Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f32efebfcd13c9e…

MALICIOUS

PDF

81.1 KB Created: 2021-04-01 02:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 387b324aec3fa742d9f3c79590411a1a SHA-1: e7c7117d190ca2f720ad0e6dcdf130dc209a0c6e SHA-256: 4f32efebfcd13c9e276cc038c70a9124fedb769b167039cdf250e1e2f98cc310
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 0.9994

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://jumiwimov.ru/123?utm_term=microsoft+word+residential+lease+agreement+template PDF link annotation
    • http://spoonnumberone.xyz/asus_rt-ac87u_router_specs33xfi.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/97764907582.pdfIn PDF document text
    • http://vizionsmc.net/982205239758rc65.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/rareruriguxuxize.pdfIn PDF document text
    • http://sentytld.online/logistica_de_aprovisionamiento77ori.pdfIn PDF document text
    • http://mmeueue.space/anne_carson_autobiography_of_redwy4cm.pdfIn PDF document text
    • http://raisinsapp.club/chronotherm_iv_honeywell_manuale3w8z.pdfIn PDF document text
    • http://reduslim-siteofficial.site/what_is_humanistic_existential_therapyac9h5.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/artificial_intelligence_markup_language.pdfIn PDF document text
    • http://idealslim-ordina.site/dewalt_miter_saw_stand_wheel_kitcow6u.pdfIn PDF document text
    • http://buyfastedcircle.xyz/the_shack_free_download_movie7r588.pdfIn PDF document text
    • http://medicinfo.online/baked_cod_recipes_no_lemonf9c0n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dagasopones/epson_artisan_725.pdfIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_5cc66f575ad646118bbcb337fa75ffbc.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_6de169d50f2443858f8bf5735d9709a7.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_a7797ab604b64528b588a48cfc177496.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/23526008276.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/38826018611.pdfIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_709cbc3a636b41c29081faa8d7ea8bf7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tosego/bosoziferarukezukurapob.pdfIn PDF document text
    • https://8458b573-1d6d-478c-912c-b10a972f31df.filesusr.com/ugd/150112_18c391032e3847688cfe1353f7a7ff6f.pdf?index=trueIn PDF document text
    • https://0dd0cd87-80d3-4eb5-b9c6-73c43c3a6fca.filesusr.com/ugd/f0b6b3_1827297887224db19dec91877a04aa67.pdf?index=trueIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_4e99f74e491e4cb58569ad24189d2eed.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_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 5572 bytes
SHA-256: 0700aba3c09fe264da317d0fafbd6a5e553fc4ff54c29932cf8a6532a05b6ce7
font_01_sfnt_off00011304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 10356 bytes
SHA-256: 87cb3fafab6f06cd85f42f9cce14de15f1f43f157127628a15210ea10bbf9c9e

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