Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b9ae24d93c67c7…

MALICIOUS

PDF

75.7 KB Created: 2021-04-11 21:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5d40ac614c700a3d909946ebab45dd28 SHA-1: 2b79137fc66dc5fc868f9782f35d3d0416ec8583 SHA-256: 54b9ae24d93c67c768b2c5caa9e323c4b7e114c045d66626ec3d37c143937eb4
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious websites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=how+to+effectively+manage+change+within+the+team PDF link annotation
    • https://babixedijifaz.weebly.com/uploads/1/3/5/3/135385025/cd1c28fb7f0ea.pdfIn PDF document text
    • https://zipibolusoxa.weebly.com/uploads/1/3/4/6/134627603/luxama_xurokakewu_tepinapaxeb.pdfIn PDF document text
    • http://rusherx.studio/nerf_basketball_hoop_instructions7q9c4.pdfIn PDF document text
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/4936314.pdfIn PDF document text
    • https://mipapipav.weebly.com/uploads/1/3/4/0/134012398/40d5369cea356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427783/normal_5fdca8e6a56da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_6011a0499fc0e.pdfIn PDF document text
    • https://bodupakodekafas.weebly.com/uploads/1/3/2/6/132680796/tagawedokebogur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461205/normal_60669548596f7.pdfIn PDF document text
    • http://mihetos.xyz/24617933016je5r7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480745/normal_5ffff65d1e288.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5ffaa42ad5301.pdfIn PDF document text
    • http://tibetterrier.ru/7172263722197q9c.pdfIn PDF document text
    • http://pedron.fun/alter_ego_plus_b1_free_download1fn9i.pdfIn PDF document text
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/6478808.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa373fa-174f-4c6b-9a82-f4da7cc94c54/zedobi.pdfIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_b660e1829e4e49888b571327020aab02.pdf?index=trueIn PDF document text
    • https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_1a5f36ce3e51453a9bea804d2af2ee6f.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_1ccdb33cc04e4f789488b30c3585d210.pdf?index=trueIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_9b864de68ef64ee5b0c502739241b13f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/148aa81c-8b24-425a-99cb-4ddbd3108f8a/who_god_says_i_am.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_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 5236 bytes
SHA-256: a41309068690738f944e56a4c11cf0bd7d4217b030999e9a666ab6232b554ff8
font_01_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 10652 bytes
SHA-256: 6be7a3a291cd1102a6e8daffcaf1e4c9d76e40d43ec77ed9ff3eb20af8e86ab6