Malicious PDF — malware analysis report

Static analysis result for SHA-256 87432b7bbb674a1f…

MALICIOUS

PDF

82.7 KB Created: 2021-04-29 11:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 56c3bd88074f7d2c1204e87af4d22c3d SHA-1: 2e9d71ae491683b6d6b9e77fd4db3cb050335cda SHA-256: 87432b7bbb674a1f9b4a6e9711e37f668f51de5afbf2d22ae36bb25688b896c4
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing lure. The document contains numerous embedded URLs, many pointing to disposable hosting, and one prominent URL suggests a deceptive download offer for grammar correction software. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://lozipotod.ru/strik?utm_term=english+grammar+sentence+correction+software%252Bfree+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415944/normal_601b2c15c6427.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496580/normal_5ffb1daf3382b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370299/normal_6009547701244.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/contract_farming_agreement_format.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372104/normal_5ff4a5ef00436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_6048c450e81be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485448/normal_5ffd1fd5a765f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384482/normal_6038883c11831.pdfIn PDF document text
    • http://mofobawosenej.mygamesonline.org/xomipadaletigupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410211/normal_5fea34cb5525a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_60356bcb11220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_5fdb2792bcb61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448727/normal_6056ba3c81b72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_6025c7333cec1.pdfIn PDF document text
    • http://viwesisikumebi.getenjoyment.net/48743322216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_603aaf07562f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488090/normal_600db9d4eba9a.pdfIn PDF document text
    • http://pikegupima.medianewsonline.com/81047086508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497131/normal_6029a8c202b05.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/fugida.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487623/normal_5ff33f709a72d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jitawidavez.atwebpages.com/30546248138.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/prsu_b._com_1st_year_syllabus.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/cuales_son_los_titulos_de_credito_derecho_mercantil.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_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 5484 bytes
SHA-256: e8279b68f0b39609899ea2d6f5fc5ff254714caaee8a2f03c06709748cebe11c
font_01_sfnt_off0001165f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165F 11552 bytes
SHA-256: d7c8d8076c07c3ed4274786bfea4ba9740c477254468e59e57a3809de06cac46

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