Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbcd82ed01dd580…

MALICIOUS

PDF

77.6 KB Created: 2021-03-24 18:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8944aae5aaba8b86c34cfdb2908502b4 SHA-1: 8f2706a6bf5479d4f58c520c0e1f6015ac03bcf2 SHA-256: 2dbcd82ed01dd58013bbe5e30ba084b2f8779a5a96f47da34de0aee0bfc447d5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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/123?utm_term=undo+archive+gmail+android PDF link annotation
    • https://lukibufipijuzom.weebly.com/uploads/1/3/3/9/133997252/lisudumetolilari.pdfIn PDF document text
    • http://2220202.ru/6490878467428gl2.pdfIn PDF document text
    • https://budojidotepaso.weebly.com/uploads/1/3/5/3/135312143/b600143.pdfIn PDF document text
    • http://doorstepcomputers.com/xadusi8gxxr.pdfIn PDF document text
    • http://zevibeponakat.getenjoyment.net/94071941000.pdfIn PDF document text
    • http://lixuninipakimar.iblogger.org/bozisinujinuwerat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419413/normal_605319fabd772.pdfIn PDF document text
    • http://damita.fun/survival_of_the_fittest_mtg_legality2x1n8.pdfIn PDF document text
    • http://storeyou.store/ar-15_scopes_vortexyc3if.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473403/normal_5feef6472dd62.pdfIn PDF document text
    • http://reawolt.online/91952850359ockpk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zagupijalixi.myartsonline.com/punctuation_worksheets_for_grade_5_with_answers.pdfIn PDF document text
    • http://wolumonixor.epizy.com/guvimijiwo.pdfIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_93db4052f9034fa393fc00ccb7a415b6.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_3828743d53884778baa9fb7cd7a84743.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 5224 bytes
SHA-256: 9bdea5550708d064da2953fb2b7b3ff9b239066fe920fbfc460edc74807ca354
font_01_sfnt_off0000eef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF3 11136 bytes
SHA-256: 3d46ff061dc69362df7cade21eacbc6928434645adf652a2f3126bd4bb5c4e75
font_02_sfnt_off00011524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11524 16140 bytes
SHA-256: c04054008ccb23e916d4752237ac69ae0f991761501974eaadaba6b3457dac05

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