Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c4efd551276e6e…

MALICIOUS

PDF

77.0 KB Created: 2021-04-23 23:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6f93d96775324bd5a0a19fd37f0f32bf SHA-1: 581b1ce8f1c1e9f0a3622f46fd9cd1c87885c551 SHA-256: 24c4efd551276e6e8596ff421e2159f37d38742c5e52ffd8e487fa8fd7d910bd
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of multiple suspicious URLs and the overall heuristic profile suggest this PDF is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=principales+funciones+del+gerente+de+recursos+humanos PDF link annotation
    • http://witaxolexigabi.mywebcommunity.org/classifying_triangles_graphic_organizer.pdfIn PDF document text
    • http://smcjd.com/landisgyr_e450_user_manual5s0os.pdfIn PDF document text
    • http://neojust.ru/power_plant_interview_questions_for_electronics7j2xj.pdfIn PDF document text
    • http://wojazilasifef.iblogger.org/4096014749.pdfIn PDF document text
    • http://zewenidasi.iblogger.org/88391835673.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/fibromatosis_musculo_aponeurotica.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/majora_s_mask_n64_guidegbfh5.pdfIn PDF document text
    • http://tevuvisena.iblogger.org/jazz_caller_name_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493610/normal_6016a647e79de.pdfIn PDF document text
    • http://moymagazin.xyz/birthday_song_with_name_maker_app_downloadbxc2g.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/mobadogaxot.pdfIn PDF document text
    • http://andyhong.blog/table_top_racing_world_tour_apk_revdlc9hdl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_602489ca5744b.pdfIn PDF document text
    • http://love-cosmetics.shop/447536810393itp0.pdfIn PDF document text
    • http://aydym.club/10020120343t4z50.pdfIn PDF document text
    • http://businesslinecenter.com/epub_to4r61t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5b0ea1c3-b874-41d5-a3cc-49595beb80a6.filesusr.com/ugd/0c63be_f2b8cf48fa154735b418d5301407c362.pdf?index=trueIn PDF document text
    • http://xipanizi.myartsonline.com/zukidob.pdfIn PDF document text
    • https://8458b573-1d6d-478c-912c-b10a972f31df.filesusr.com/ugd/150112_2f1e3821a40243e2a1763ac444b6dbc6.pdf?index=trueIn PDF document text
    • https://df6a9abb-74f3-47e1-b359-fe6d1019da36.filesusr.com/ugd/7921d2_77120b0eff144740a5dd8faf8db7dc13.pdf?index=trueIn PDF document text
    • http://gixarewujedel.atwebpages.com/civil_engineering_projects_download.pdfIn PDF document text
    • http://linewezidewixa.rf.gd/liduvixadek.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_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 5568 bytes
SHA-256: 30c78479e82d39cc9e95a9d431280cdbd5ec4e2c2ad6ab680b551a1d24b87000
font_01_sfnt_off0000fdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD5 11760 bytes
SHA-256: a9ea8d0ab76677a81bfb663d58aff485f049fd9d29f9c9495dcedd4513768932

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