Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ab404b74dc7377…

MALICIOUS

PDF

85.1 KB Created: 2021-04-26 06:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0c053a7eb318793e2f201cf9bd5410e0 SHA-1: b6c1440e6524af7eeac957c7f8534ba376973d9c SHA-256: a5ab404b74dc73776bc28ffd55dd642190004a8c4f176a085256b0bcf7c4e891
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=ge+spectra+self+cleaning+oven+owner%2527s+manual PDF link annotation
    • http://mekomob.getenjoyment.net/all_about_interior_design.pdfIn PDF document text
    • http://lowadikewafuber.iblogger.org/didarimogojavaxipajejiz.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/82381699579.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/56726311273.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/pdf_reader_app_small_size.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/39703277985.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/dutuxazisaxidupudofos.pdfIn PDF document text
    • http://tuduvodakep.mypressonline.com/tamil_news_paper_download_app.pdfIn PDF document text
    • http://dojaligiwojop.22web.org/98017824030.pdfIn PDF document text
    • http://wokulorumal.iblogger.org/psychoterapia_poznawczo_behawioralna_popiel_chomikuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ninukak.epizy.com/dosis_cefotaxime_anak.pdfIn PDF document text
    • http://sugexure.rf.gd/jenafokobefi.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_cdfdba09f49849fe88f266387ac790ef.pdf?index=trueIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_23fdb68a9f8946f0a5ffe957d83b05fc.pdf?index=trueIn PDF document text
    • http://pesusakosu.rf.gd/90683907067.pdfIn PDF document text
    • http://mevonaku.rf.gd/tedita.pdfIn PDF document text
    • http://mazavenekixibu.rf.gd/38399289811.pdfIn PDF document text
    • http://punonawu.rf.gd/cinquenta_tons_de_liberdade_download_gratis_portugues.pdfIn PDF document text
    • http://davofunup.onlinewebshop.net/ribeberuzotozizomomumam.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/pijola.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/ddo_curse_of_strahd_guide.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/lala_ramswaroop_ramnarayan_calendar_2020_free_download.pdfIn PDF document text
    • http://kerizef.rf.gd/annamalai_film_bgm_free.pdfIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_4e66a5b1e682405380c32dac6a7d13db.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_ae318f2f85ac48298201e13af80cae31.pdf?index=trueIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_3783e3a0b483451797465c8516e6ecc7.pdf?index=trueIn 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_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 5552 bytes
SHA-256: aa5cf64fc55ddf592d36c5bf4c2a30b5ae1e74510eafd65a769eafa20f4112e8
font_01_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 11592 bytes
SHA-256: e8a8770907faf2b70214a5798bd75d2dff1e8e99f4f09054f47e92e82eb78e4d

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