Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc445027e3209e5b…

MALICIOUS

PDF

77.4 KB Created: 2021-04-06 10:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 715c1de79cd292a50df2fe81c9ba836a SHA-1: a34c1804b3227ba8a380bee5fe981a2d4a0d689d SHA-256: bc445027e3209e5bcb49257101bea761430cb8180838c5d0052766ab4214c2c8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or phishing operation. The primary external URI points to a URL that appears to be a redirector, likely leading to a malicious site. No scripts were extracted, but the PDF structure and numerous external links indicate an attempt to redirect users to potentially harmful content.

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 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.
  • 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://xajibur.ru/strik?utm_term=resumen+capitulo+1+y+2+metodologia+dela+investigacion+sampieri PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450512/normal_601a7a3b032fd.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/99351834257.pdfIn PDF document text
    • http://pijubunoze.22web.org/adverb_clause_quiz.pdfIn PDF document text
    • https://ganunosor.weebly.com/uploads/1/3/0/8/130814229/vuwukaxone.pdfIn PDF document text
    • https://jodeliloku.weebly.com/uploads/1/3/5/9/135975589/9f01677afa10137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481161/normal_6033026f8e180.pdfIn PDF document text
    • https://panikelixiguju.weebly.com/uploads/1/3/4/4/134478359/bc942d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_604623025a9d7.pdfIn PDF document text
    • https://funoridarudaru.weebly.com/uploads/1/3/5/3/135304061/879245.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446944/normal_605ef1e820608.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowesiredud.epizy.com/abrahaminte_santhathikal_bgm.pdfIn PDF document text
    • http://zutulig.epizy.com/pomofolaverokiwojareko.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_2e832fc11f7043b581afedacb39c7f7e.pdf?index=trueIn PDF document text
    • http://paxerakomis.onlinewebshop.net/pupukipeb.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/21460751894.pdfIn PDF document text
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_2c04448e10a2489d90af67e57b8667c0.pdf?index=trueIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_909766e3f0af48b4aa90d1da5e5912cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fapaga/3086688210.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_c82850936b6c4c9a8631b6aa7f571ad1.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_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 5744 bytes
SHA-256: 8012f9405cb3f0d7d5033a312dcbacee93327bbfec0e78d3eeff7fbca5589851
font_01_sfnt_off000100c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 10712 bytes
SHA-256: 94199b8d1fbb25e198564f2167bbca2783b769a98a5f01108256ca768a8ca0f2

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