Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4161e113f5df9b…

MALICIOUS

PDF

77.8 KB Created: 2021-03-20 01:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8e3075de23468beba0d541f722812fc2 SHA-1: 2a0acf5b4e9fa990aa09e1814c6ade6a27483ac1 SHA-256: ec4161e113f5df9bd06541afa724cc0ac7fad09a8fb2d56af742abcc40add666
134 Risk Score

Malware Insights

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

The PDF file contains numerous external URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites, potentially for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=vidmate++old+version+2018 PDF link annotation
    • https://wanalepawipetep.weebly.com/uploads/1/3/1/8/131857983/kumudulilag-vovimepu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485446/normal_5ff42925c8ea4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470380/normal_60011ba0dc300.pdfIn PDF document text
    • http://lezefax.22web.org/aula_1_espaol.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/steuererklrung_2020_anlage_v.pdfIn PDF document text
    • http://fafuzum.sportsontheweb.net/canon_rebel_eos_ds6041_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_60551fd594a65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368251/normal_5fcede3997cf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370780/normal_5fcb6e55c1cce.pdfIn PDF document text
    • https://tutonaxubetu.weebly.com/uploads/1/3/5/2/135296536/c776cf0eb35.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/convert_from_to_word_document_online.pdfIn PDF document text
    • http://bixapusaxoxuw.iblogger.org/how_to_be_a_good_movie_director.pdfIn PDF document text
    • http://dofitodisibo.22web.org/how_to_make_a_trivia_game_on_powerpoint.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_9a4bcaf060994df8a1ce3703b7648b78.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefabe/anlage_av_er_2017.pdfIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_9970cc8e1dc24070a321b91ff2f265bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/redrafting_2013_nba_draft_bleacher_report.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_40a2facdaf4347298714b56e0140272e.pdf?index=trueIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_2ecdd1caed674a18b38c1742ba7fc026.pdf?index=trueIn PDF document text
    • http://gikunipif.epizy.com/78569029801.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/duvanefopalonoxewam.pdfIn PDF document text
    • http://petojijoxura.onlinewebshop.net/does_the_justice_system_work.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_c38b42cd36ba4f77a9c6029982115ab5.pdf?index=trueIn PDF document text
    • http://wewimolu.epizy.com/75820285367.pdfIn PDF document text
    • http://positajugopisu.myartsonline.com/analytic_number_theory_notes.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_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 5516 bytes
SHA-256: 34666e184fac51481afef358d2d36186b35fb50ccc4b8e19c66cf99773b83ed4
font_01_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 11948 bytes
SHA-256: caf6b60a50f14b7b4a7a22ea6e96dcfdef99cf42a4d93084d96fc5dd58f73800