Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43ed0e9b72808bc…

MALICIOUS

PDF

77.1 KB Created: 2021-02-20 02:32:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 040d5f13e7a55750cba3253ea1ffc9d0 SHA-1: 168adef6598b8067711763693d269c00da55d34b SHA-256: c43ed0e9b72808bc217b8732950483737ff912e6cc726ffb192a6cdb18450dad
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a characteristic of link farms used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://baarspo.ru/123?utm_term=what+girl+names+mean+love PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387918/normal_60088aa2b1294.pdfIn PDF document text
    • http://turodes.iblogger.org/86690346769.pdfIn PDF document text
    • http://optamorem.com/president_roosevelt_four_freedoms_speech_summarywcstb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490138/normal_5fe17e78c8ff2.pdfIn PDF document text
    • http://fionainthefield.org/2009_dodge_challenger_srt8_performance_upgradesgugj1.pdfIn PDF document text
    • http://duplicwcnj.space/vidmate_app_apk_2018afofv.pdfIn PDF document text
    • http://fb-ig-copyright.com/32009563159z505v.pdfIn PDF document text
    • http://j3vnci4.xyz/dipefevis0g1t6.pdfIn PDF document text
    • http://vk-settings-change.online/xenobiotics_biochemistrylpvj4.pdfIn PDF document text
    • http://reduslimitaly-official.site/manuale_digitale_art_clasa_7_biologie8t4y8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381081/normal_5fec6db41882f.pdfIn PDF document text
    • http://vinograd.io/insinkerator_evolution_compact_spec_sheetjlee0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_6009dfb9739e4.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/piradi/39071892214.pdfIn PDF document text
    • http://goromanoza.rf.gd/fusionner_deux_documents_en_un.pdfIn PDF document text
    • http://kagapari.rf.gd/fofatoboxedovel.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_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 4960 bytes
SHA-256: e2e672380f7d5e726bec028acfa89903e4906cb7bf493a2d812f556372db7daf
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 11452 bytes
SHA-256: a8f741367ce6d425ffe27c477130021812d3bed4993c0b31f9aabd316964bb8a
font_02_sfnt_off0001197b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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