Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f8738392b847612…

MALICIOUS

PDF

76.8 KB Created: 2021-03-11 05:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 33868c2b42128fc4401abeaa35519558 SHA-1: 1d6266be5952ebc0bbb25ba6185357722e9db8a7 SHA-256: 1f8738392b847612f6caa63b656a02e0ea9592ee40a006fb53f3b9f86665af96
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-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://baarspo.ru/123?utm_term=cheshire+east+local+plan+inspector%2527+s+report PDF link annotation
    • http://begemotiks.fun/amharic_bible_free_for_androids4i7c.pdfIn PDF document text
    • http://bachanalytics.com/5401380153z8kzh.pdfIn PDF document text
    • http://fherixq.com/download_kodi_leia_18.1y73th.pdfIn PDF document text
    • http://fozakewugumomig.22web.org/77878780513.pdfIn PDF document text
    • http://lassituda.online/viguwebipadinituzutenimv3vsp.pdfIn PDF document text
    • http://momsmall.space/647486783403gnpz.pdfIn PDF document text
    • http://creamwalls.online/20232822492vnfy0.pdfIn PDF document text
    • http://autocredit.moscow/7179112000305jy5.pdfIn PDF document text
    • http://maturibcgj.space/491835927522ep0j.pdfIn PDF document text
    • http://vk-settings-change.online/72495635701b6yqs.pdfIn PDF document text
    • http://academic-club.ru/6762150954797y8p.pdfIn PDF document text
    • http://oneitshop.info/xakufozixeleg81ga7.pdfIn PDF document text
    • http://idem-peshkom.ru/27840738524324aa.pdfIn PDF document text
    • http://counterman.ru/52760749796c767c.pdfIn PDF document text
    • http://eeeeeyyy.space/66033692085ehuy2.pdfIn PDF document text
    • http://7gusevshop.space/dictionary_of_literary_terms_and_literary_theorypgagz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zuponefi/34704243798.pdfIn PDF document text
    • http://depegiwisa.epizy.com/dell_xps_8300_power_supply_problem.pdfIn PDF document text
    • http://zakivijojinikij.epizy.com/60335961793.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/sidalunamufotolitido.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/78785169929.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F3 4868 bytes
SHA-256: f564cd4c01bb0bd01689f8aa40b6ef61e2fcbf465e8d6f33e0795f130499d61e
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 9912 bytes
SHA-256: 381fb5891c681f1da91cf05fd2b8d1e4a4a6fe140b92acec692a65fd4f465099
font_02_sfnt_off00011776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11776 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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