Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d1297fcdd3b22e…

MALICIOUS

PDF

78.5 KB Created: 2021-04-25 07:29:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9810da8b3f16c4e17202fc211461d47a SHA-1: cf489fd8d495c172725301efc9f32a1d70d00153 SHA-256: b3d1297fcdd3b22e517e5eab17b460ed00f4b5a581e73cce3516b03e83f79060
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to trick the user into clicking these links, likely for malicious purposes. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards a malicious document, likely a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/strik?utm_term=how+to+get+a+bartending+certificate PDF link annotation
    • http://lonemap.medianewsonline.com/android_espresso_tutorial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368972/normal_5fe4816a6568f.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/lalud.pdfIn PDF document text
    • http://gupirigugorixuf.sportsontheweb.net/9404408503.pdfIn PDF document text
    • http://vabakavolageni.22web.org/31962425123.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/mumejusolaja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412761/normal_5ff8aab31293d.pdfIn PDF document text
    • http://lipejunotuxo.22web.org/way_to_prevent_coastal_erosion.pdfIn PDF document text
    • http://narovomesizi.medianewsonline.com/tipos_de_reacciones_antigeno_anticuerpo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_6059a0faf1644.pdfIn PDF document text
    • http://pemufosapakem.mypressonline.com/traductor_de_espaol_a_ingles_con_pronunciacion_lenta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_5fdc683149fe9.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/14705064298.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/zuponefi/jamurosatul.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/business_development_strategy_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/drinking_water_guidelines_canada.pdfIn PDF document text
    • http://bilisedutave.myartsonline.com/how_to_hook_up_rca_home_theater_system.pdfIn PDF document text
    • http://livikunaxexo.rf.gd/galvus_y_metformina.pdfIn PDF document text
    • http://safonakidu.rf.gd/example_of_background_of_the_study_in_research_proposal.pdfIn PDF document text
    • http://jukasuxoseki.atwebpages.com/wordly_wise_3000_book_8_answers.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_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 5172 bytes
SHA-256: 8eac3faa70e4892526c245b8d93df602c3fb07290d255a1fb582553b863391aa
font_01_sfnt_off0001056c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056C 11500 bytes
SHA-256: 3221cb1aec091392063a5543be1e7bda937451f7f4949a8e5269b6f4949d303d

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