Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ad9e912753ac85…

MALICIOUS

PDF

67.6 KB Created: 2021-03-03 03:29:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b8867ce8d0e45dca5a8aa3ec92cfe893 SHA-1: 25d3676b91b964ce9f4ba4cc6b4c091b11155d9b SHA-256: 84ad9e912753ac8555db3474db0ea763219cbab34c3622f6567814cd96ad22c9
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed 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://zajinet.ru/award?keyword=collins+advanced+spanish+grammar+pdf PDF link annotation
    • http://levantemosaic.com/gunslinger_5e_matt_mercerpziyq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_602abb67b2720.pdfIn PDF document text
    • https://vevabute.weebly.com/uploads/1/3/4/2/134265428/rumufukewibox_kogubulo_ridusulivojamix_pevikemet.pdfIn PDF document text
    • http://vobigabifinu.22web.org/number_theory_and_cryptography_coursera.pdfIn PDF document text
    • http://shoop-fe.ru/segundo_curso_de_contabilidad_eliasf4cfr.pdfIn PDF document text
    • https://xesamubi.weebly.com/uploads/1/3/4/0/134095888/xawizemowefani_rojebedutedi_pasubepiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_600fc5efa152e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407784/normal_603441b38d55b.pdfIn PDF document text
    • https://pomaxobizo.weebly.com/uploads/1/3/1/1/131163853/numuvewasete_xidagabojeti.pdfIn PDF document text
    • http://sberhome.ru/413000879193s2on.pdfIn PDF document text
    • http://wow50.pro/how_to_reset_my_printer_to_onlinergsz6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_600c99e065259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392873/normal_6035d28564fb5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404287/normal_5fde69fb49dcd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vezuzatutuxi.epizy.com/40101919951.pdfIn PDF document text
    • http://tajiranolis.rf.gd/c.s._lewis_mere_christianity_study_guide.pdfIn PDF document text
    • http://bajolufek.rf.gd/10076624581.pdfIn PDF document text
    • http://rutipozi.epizy.com/31674079752.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_off0000cba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA4 5532 bytes
SHA-256: efb7179d8c32de4decc429ce3dde487f9b55580b191c4ad251f86650f0eb2553
font_01_sfnt_off0000de4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4F 10164 bytes
SHA-256: f58a095724ecf691b786488133012458f82192a91d42699ba7dd75424c7a6beb

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