Malicious PDF — malware analysis report

Static analysis result for SHA-256 b338d3d042ec5aea…

MALICIOUS

PDF

72.4 KB Created: 2021-06-07 03:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7444838894c3db4786a0ac4d4c2cfb62 SHA-1: 1b5d648d06de1ed8c8f25d7ee4f045861214a5cc SHA-256: b338d3d042ec5aea514adfb970d078a073f38f776ba8dd030c7753840b4fce47
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/pbw?utm_term=set+it+off+pelicula+gratis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500669/normal_6042a8d4615b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393499/normal_605c9e3a00000.pdfIn PDF document text
    • https://bodadesoka.weebly.com/uploads/1/3/4/2/134234706/1091ccc16.pdfIn PDF document text
    • https://zufulakoloti.weebly.com/uploads/1/3/5/3/135301661/8224920.pdfIn PDF document text
    • https://lasuresupaka.weebly.com/uploads/1/3/2/6/132683400/8537181.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382965/normal_5feff640b6f2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_605c254a47413.pdfIn PDF document text
    • https://mamonujiduvef.weebly.com/uploads/1/3/4/5/134525279/9509016.pdfIn PDF document text
    • https://fofalada.weebly.com/uploads/1/3/5/9/135968840/9150775.pdfIn PDF document text
    • https://jelujelaxaku.weebly.com/uploads/1/3/4/8/134894726/gigivakega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_605d780425ff8.pdfIn PDF document text
    • https://datafixujur.weebly.com/uploads/1/3/7/5/137516556/vodivuvawuje_tanakepeja_siditefivip_fijewixexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488336/normal_60386143b4e4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_6021cc7f54eba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bojirakaj.pbworks.com/f/comment_faire_pousser_les_cheveux_crpus_plus_vite_astuce_maison.pdfIn PDF document text
    • http://wirajudukim.pbworks.com/w/file/fetch/144760143/poder_general_para_actos_de_dominio_o_de_administracin.pdfIn PDF document text
    • http://mokapuv.pbworks.com/f/88862024601.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/f/86721278730.pdfIn PDF document text
    • http://jobagej.pbworks.com/f/maxomumumixowekubojobi.pdfIn PDF document text
    • http://tereburokofe.pbworks.com/f/53321055273.pdfIn PDF document text
    • http://pidexuxok.pbworks.com/w/file/fetch/144604104/catalogo_lusac_2019.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_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 5288 bytes
SHA-256: 24eb57ad1e9301b6bccc43178f1726067a0bc13ff0cbc5b9092c049d9b1eb75e
font_01_sfnt_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 12064 bytes
SHA-256: 3889128f404aff03710b3b1dc43510cf8110d1954c663d09aa4b8429614bd6dd

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