Malicious PDF — malware analysis report

Static analysis result for SHA-256 f284d53e016fb2ac…

MALICIOUS

PDF

76.3 KB Created: 2021-03-16 07:20:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0ff04357097d5b0e64d1cd310ad641c8 SHA-1: ce60bf55a34d8a92b229221cce5fda8d98ae939f SHA-256: f284d53e016fb2ac1967ebe654033ffd80a9a4683803ebf7b6c6a4c682cdae32
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external URLs pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute phishing content. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to these numerous external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://jottigo.ru/award?keyword=b1+english+reading+books+pdf PDF link annotation
    • http://giwapozolaleg.mypressonline.com/2003_infiniti_g35_automatic_transmission_fluid_capacity.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445888/normal_60080afc96354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_604fbddf551b5.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/zekabifugedoju-lezixo-lewokitukugutob-zolem.pdfIn PDF document text
    • https://tunibedexorole.weebly.com/uploads/1/3/5/3/135350281/906d92405b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501998/normal_6015ca4494084.pdfIn PDF document text
    • https://gegirugotosizuk.weebly.com/uploads/1/3/5/3/135397722/9310344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_6044cbd888eb9.pdfIn PDF document text
    • http://lebofawudire.mygamesonline.org/jopazib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_6015883eaea20.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/ge_phone_number_for_service.pdfIn PDF document text
    • https://xojutezakiveze.weebly.com/uploads/1/3/5/3/135318362/sexobuzib_xasefasareg_ragafegogisoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501057/normal_5fde6b53aa208.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://velelakolifuvu.onlinewebshop.net/multivariate_analysis_in_community_ecology.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_68a1d73eb84d47ab8c934b9b2ec30ec2.pdf?index=trueIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_56939fb373b34c729b47320a157e4e6f.pdf?index=trueIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_268bcac2a9604b5b88b24c9ce16557a7.pdf?index=trueIn PDF document text
    • http://riveminigokoxa.myartsonline.com/mexico_barbaro_john_kenneth_turner_libro.pdfIn PDF document text
    • http://gujimosodaza.myartsonline.com/irving_janis_groupthink_book.pdfIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/53636412780.pdfIn PDF document text
    • http://sofibimibojas.myartsonline.com/internal_auditing_assurance__advisory_services_third_edition.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_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 5608 bytes
SHA-256: d3d42c9b83458fbb78636a6dd2e6433f82e7ed15a30a2d1d3d9c1e039e66daad
font_01_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 10760 bytes
SHA-256: 87af79faf69cba8d35e65a50f6a27bd53b42eed212419a1cf4cad7b7aeac611d