Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27371bdc6c1f784…

MALICIOUS

PDF

82.4 KB Created: 2021-04-08 19:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b8a1def50afbff089446f1b80d91f343 SHA-1: 287ce69182fa77e225657f95fa82736eefb1321a SHA-256: b27371bdc6c1f784c1b9a393b28c7eb78dbda03e13620fe43f6e52e2ef1a578e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9990

Heuristics 5

  • 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 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://xezojetit.ru/strik?utm_term=why+was+roomba+980+discontinued PDF link annotation
    • http://poposiruta.mywebcommunity.org/vaxuw.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/iDhfhia/kunexuwijesapubov.pdfIn PDF document text
    • https://dorewedekubur.weebly.com/uploads/1/3/4/7/134721360/jonan-fowib-degobaxuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482631/normal_60065b9c56379.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/15282135525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_606530b95dbc3.pdfIn PDF document text
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/titatafomifavezok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401517/normal_5fe55543d985b.pdfIn PDF document text
    • https://nekusudowup.weebly.com/uploads/1/3/5/3/135315851/roxobumimitum.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/HgiEje7/papizobarufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366384/normal_60058bd63dfa7.pdfIn PDF document text
    • https://dovavifedudefew.weebly.com/uploads/1/3/2/7/132710721/3072918.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419225/normal_5fff7837a4e57.pdfIn PDF document text
    • https://vagofavom.weebly.com/uploads/1/3/4/4/134486407/7161757.pdfIn PDF document text
    • https://tenetowebobidiv.weebly.com/uploads/1/3/4/6/134635535/d1be5c2b57.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/remibevefuwutalojobadezup.pdfIn PDF document text
    • http://gigezojiradof.scienceontheweb.net/affective_domain_assessment_tools.pdfIn PDF document text
    • https://luletifolavok.weebly.com/uploads/1/3/4/3/134369244/8820441.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/f80ed6445e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/15040aa3-0443-422d-b581-3a4530445a9e/gigabyte_d3306_motherboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e87dab-c407-4ab6-b917-9bc954a1fcfa/kitoxozuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/243ee490-446b-4ccb-a24a-eb537a531ec1/lowrance_elite_3x.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e188cc-56d3-43e3-ae37-1103328dca6d/19062892008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bcb32d8-75f9-472e-868d-c7e37c5125ad/57385030583.pdfIn PDF document text
    • http://wipibefab.onlinewebshop.net/anlise_combinatria_e_probabilidade_sbm.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF401 5868 bytes
SHA-256: 4af733da6304babd9997709fb900293aa13ddb94ea0fbfdc6d1c88b1fb6c16b6
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 11408 bytes
SHA-256: e91351bb46b66e3a44792de8d67e52f2c46566c80c588fa471bbab42b295f9fb
font_02_sfnt_off00012dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378