Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf64f83dc7a813f…

MALICIOUS

PDF

74.2 KB Created: 2021-03-10 04:04:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8f00e05fbec7bfb689072a62cd817118 SHA-1: 38ae6e8d8fcd3d32fe47f8ada72a024412912dae SHA-256: caf64f83dc7a813fd2dae539ca4d2003c451e2e808ec041f240805b5ad565121
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt, likely using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://vilenefex.ru/award?keyword=blaze+pizza+application+pdf PDF link annotation
    • http://robinmani.site/823370478243wrdh.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/safety_not_guaranteed_rotten_tomatoes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412593/normal_5ffcf5c098211.pdfIn PDF document text
    • http://lotto-investclub.com/621350525188c9sl.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/pefizuwaxajatep-femetumagam.pdfIn PDF document text
    • https://fotizewuzawefuv.weebly.com/uploads/1/3/4/6/134668380/6976984.pdfIn PDF document text
    • https://sifixibufe.weebly.com/uploads/1/3/4/3/134348909/wuvigaxufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_6015a52d26ae2.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/illinois_reg-1_form_instructions.pdfIn PDF document text
    • https://medijomozu.weebly.com/uploads/1/3/0/7/130775841/sivukurunat.pdfIn PDF document text
    • http://netewe8.xyz/452842368015dzh4.pdfIn PDF document text
    • http://megatorg.ru/what_is_defect_triage_process3ul7m.pdfIn PDF document text
    • http://garant-ritual.online/vasiwajowapeze484br.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_5fd77f873a53c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jewezoku.epizy.com/rulupusuxivumarijut.pdfIn PDF document text
    • http://rizibapuzaduxe.epizy.com/ponamakapuva.pdfIn PDF document text
    • http://revuzulikasulo.epizy.com/galujevuwejewaziv.pdfIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_7b8e5468c5b8465192b694f98e7946df.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_5d1c452cce304f3ebe30c295b4cdaba7.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_071216badae94a94a1d1f49c1c0c96d9.pdf?index=trueIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_c7146018061348e399a361dae0d6d349.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_off0000e5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 4972 bytes
SHA-256: 4ac8eabe0cb0ceddcab4f42820ea72bb8131a70a119dd92782b7d42b8c721568
font_01_sfnt_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 10688 bytes
SHA-256: c22b584588d39fbed149da1f923b6b09e7276ac61286c16e8cf4d7a578f07281

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