Malicious PDF — malware analysis report

Static analysis result for SHA-256 218a7ed7fefec6e6…

MALICIOUS

PDF

78.0 KB Created: 2021-03-26 08:16:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 25c9ad34e4c6756750cacfd656cf432c SHA-1: 9ebe65dd67a1af37e241cf6dea9394a4efa5eaa0 SHA-256: 218a7ed7fefec6e60170f16dec7a80c673e27ca3b3827e9cd5ad94cbf80d48e3
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 0.9997

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://vilenefex.ru/strik?utm_term=michigan+legal+help+child+support PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4530070/normal_600613a2af32c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_6026a1768410f.pdfIn PDF document text
    • http://quickpapp.online/togelawilunifopifuredukab1vg4z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_604372155edda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407724/normal_5fff62644bb47.pdfIn PDF document text
    • http://gakmancreatures.ru/fireworks_sound_effects_freeprvz0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421366/normal_600fd0321b5b6.pdfIn PDF document text
    • http://pukiwed.iblogger.org/jetamelulijorid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_602d9daa70f9b.pdfIn PDF document text
    • http://promoocaoameericanas.com/minerva_mcgonagall_actressuag5l.pdfIn PDF document text
    • http://oneitstore.pro/how_to_unlock_motorola_razr2_v8_for_freeb9d6h.pdfIn PDF document text
    • http://nesobaka7.xyz/cbt_core_beliefs_worksheet7nb2j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495686/normal_5fecb5e7e03f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367283/normal_600363a7232c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pilakiniza.rf.gd/butokudura.pdfIn PDF document text
    • https://728bf1be-24e3-4891-ba98-fedceca1a503.filesusr.com/ugd/3268c8_7fba36cbe27b45728e14079d1eeb4af4.pdf?index=trueIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_0456f996483b43b1b924f43823a6c216.pdf?index=trueIn PDF document text
    • http://takerowul.epizy.com/tutudogexuverusogawudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f1b2b4e-69d7-4988-80f8-1ebaf8d9614b/72729928131.pdfIn PDF document text
    • http://lijobexabip.rf.gd/kajugovut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f974c8-8902-4e23-9c7e-9cf56740abab/how_to_begin_a_refutation_paragraph.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_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 5340 bytes
SHA-256: e8fafe654120434b166895ca4b2496c29d96ce087466ec8aca6a3215d5d977e8
font_01_sfnt_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 10928 bytes
SHA-256: 34719ebb612efeccf30d492c2886e6e5f4921449f111372e3ebea8f9d23d0a6b

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