Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8eed5b66fea3be3…

MALICIOUS

PDF

70.4 KB Created: 2021-04-08 02:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 42adcaf1d981143ec80dd6e8e9b23c4b SHA-1: 5597d00f3c31237548cb1fba28687ff058b28395 SHA-256: d8eed5b66fea3be38fea209ca67cd2c3ab3a971112469bfe6a3cee66a294cce6
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains text related to search terms, reinforcing the lure aspect.

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://xajibur.ru/wix?keyword=auto+liker+apk+for+facebook PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477367/normal_600255bec9f6a.pdfIn PDF document text
    • http://servisvds.ru/bimafazmpogw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463532/normal_5fe9ceed08f81.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/62079517167.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/jimiiUf/dosepewarerujosuvu.pdfIn PDF document text
    • http://idealica-tufficiale.website/free_spine_templates_for_bindersp3sf0.pdfIn PDF document text
    • https://cdn.sqhk.co/vojofarakiva/qjfAKIS/tuwulurewet.pdfIn PDF document text
    • http://draiwenstore.online/holt_mcdougal_larson_algebra_1_common_core_teacher_editionnr40f.pdfIn PDF document text
    • http://itasda.online/bibliografia_formato_apa_sin_autor6l2t9.pdfIn PDF document text
    • http://about-central.com/compound_subject_and_compound_verb_worksheetsjffm6.pdfIn PDF document text
    • https://cdn.sqhk.co/zubafena/pgtJUJa/pre_algebra_worksheets_6th_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_605df8933088f.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/gjhHUge/86718143325.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/i2SjdQ8/classroom_of_the_elite_episode_1.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/gClkCyk/nolawunuguvixuzobivu.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/hwagMeA/awesome_god_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tipokeviti.atwebpages.com/9096084829.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/toro_personal_pace_mower.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/final_fantasy_7_remake_xbox_series_x_release_date.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_off0000d7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 5024 bytes
SHA-256: 18cc80e39dee669667b66b8eb4d79d8f81c156c61305b53e82c9fd918c96b782
font_01_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 10484 bytes
SHA-256: 653cd25a8d7517a7dbfda2bd4f8f7ba2f00c1980d84274145881e89153ac665a

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