Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3291ef5755f580…

MALICIOUS

PDF

77.0 KB Created: 2021-06-06 02:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47722226a239da1bb3da8dd832d9c7fa SHA-1: d8de82040e597ad74f74de53e16cc938bdb55188 SHA-256: de3291ef5755f58079d2827c4ad189c50cea2790755dad6e215bd471e0f6fd04
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/123?utm_term=charlie+chaplin+2+song+video+hd
    • https://kojovade.weebly.com/uploads/1/3/4/6/134681743/2114991.pdf
    • https://nadagedo.weebly.com/uploads/1/3/1/8/131858166/sinumogozimuxozugu.pdf
    • https://regezubigif.weebly.com/uploads/1/3/5/3/135320660/9f3cd03.pdf
    • https://poliradu.weebly.com/uploads/1/3/5/9/135991332/tukekimorinepul_logisos.pdf
    • https://laxefozono.weebly.com/uploads/1/3/4/3/134361517/e39c52e590c3f.pdf
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/3910829.pdf
    • https://samarobiratepiw.weebly.com/uploads/1/3/5/3/135327643/dovenajoxoze.pdf
    • https://vekazapez.weebly.com/uploads/1/3/4/6/134601327/pejomilipu-kirisubuzila-zozoleweni-fugam.pdf
    • https://silodadut.weebly.com/uploads/1/3/2/7/132712229/gibojit_nunususabegamis.pdf
    • https://mefopati.weebly.com/uploads/1/3/4/8/134866381/kutopifasikeba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bovozajezo.pbworks.com/w/file/fetch/144692904/kuzosebitotanunefexabizi.pdf
    • http://natizasex.pbworks.com/f/dofilanuzu.pdf
    • http://xofitesu.pbworks.com/f/past_simple_past_continuous_present_perfect_worksheet.pdf
    • http://pijipusap.pbworks.com/w/file/fetch/144619878/dejikagesofir.pdf
    • http://lodedeti.pbworks.com/w/file/fetch/144652938/libro_de_ingles_de_telesecundaria_tercer_grado_traducido.pdf
    • http://medodadepud.pbworks.com/w/file/fetch/144646902/jedenojupi.pdf
    • http://xibosini.pbworks.com/w/file/fetch/144511545/how_to_cheat_swamp_attack.pdf
    • http://fulusivijomu.pbworks.com/w/file/fetch/144686994/xumozubafuf.pdf
    • http://jeselivid.pbworks.com/w/file/fetch/144620451/sobeba.pdf
    • http://xawaren.pbworks.com/w/file/fetch/144418860/29496772171.pdf
    • http://viluxese.pbworks.com/w/file/fetch/144428688/razudad.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edaf.bin
ba2945a862645267df5c514ee19a56a1318414d5e624115781f9a6d68a792578		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 5432 bytes
font_01_sfnt_off00010027.bin
805d72a82d705387671cc3a51ae9b697d6f03d14539db32f886e8558778c76a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 11188 bytes

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