Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8fd441ef5775f47…

MALICIOUS

PDF

72.1 KB Created: 2021-02-18 05:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c647f9d3844b83770756e8e54c631959 SHA-1: 7a13cad1ea498908104bc725e013d618e07b6091 SHA-256: e8fd441ef5775f4744456a909630b95199e13b4bc4a440ebc094a5ee424fd5a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and exhibits characteristics of a link farm. The presence of external URIs and the ML_NYX_PDF_MALICIOUS heuristic strongly suggest an intent to redirect users to malicious sites, likely for phishing or further malware delivery.

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://jacksth.ru/aws?utm_term=text+message+icon+png+transparent PDF link annotation
    • http://skidki-day.shop/divinity_2_build_guidekv4j9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376096/normal_5fe5976e3c2e6.pdfIn PDF document text
    • http://yarrebitteh.online/girl_crush_lyrics_meaninggepfa.pdfIn PDF document text
    • http://rafale.store/desarrollo_humano_papalia_feldman_pdv4087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_5fe82eeb54a2f.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/3200252832k89j2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495860/normal_5feffa5c4059b.pdfIn PDF document text
    • http://getyourscore.info/pile_foundation_design_excel_spreadsheet9hcl3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482188/normal_5fed9a5659b49.pdfIn PDF document text
    • https://cdn.sqhk.co/livatunozasu/igj42jd/lesson_plan_ideas_for_school_age.pdfIn PDF document text
    • http://dektesheff.xyz/tepunivibilaxisute4m1t2.pdfIn PDF document text
    • http://summ-ita.space/foro_excursiones_cruceros_mediterraneo_pullmantur8wj4n.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/ejercicios_de_caligrafia_cursiva4hp8o.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/joterige/where_do_beavers_badges_go_on_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/gomisigujutukamoriresogaw.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/fefokamulebavef.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/bimatuj.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_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 5240 bytes
SHA-256: 5a68b09b6f5ea35d4555719a6b85588067f55074ffc2a41234d14e69131012c3
font_01_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 10280 bytes
SHA-256: fc721a82077b709563a0a4ba27bc235504c75d34355ae9ae784d26fc4c42be64

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