Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf53a9d1082f2d1b…

MALICIOUS

PDF

85.4 KB Created: 2021-04-14 22:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 66d261e46488b026349372234e82d0c5 SHA-1: e798fcec08ec0afe6779d86a2e1ddeae3782457d SHA-256: cf53a9d1082f2d1b03e729295c57fc885a7fee458553156911e55f878faac5b7
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-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://dafemum.ru/strik?utm_term=boy+scout+merit+badges+needed+for+eagle PDF link annotation
    • http://sekujirimabasas.getenjoyment.net/dulefejanepopirijuf.pdfIn PDF document text
    • http://poguzozod.sportsontheweb.net/ninovigota.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/of_mice_of_men_chapter_3.pdfIn PDF document text
    • http://takujol.iblogger.org/caballo_de_troya_9_descargar_gratis.pdfIn PDF document text
    • http://bowuvudofi.scienceontheweb.net/7542519425.pdfIn PDF document text
    • http://gumidaz.medianewsonline.com/ado_activex_data_objects_creating_data_driven_solutions.pdfIn PDF document text
    • http://pefujogori.iblogger.org/beko_frost_free_fridge_freezer_instruction_manual.pdfIn PDF document text
    • http://kufowawixapiva.sportsontheweb.net/casio_w-800h_change_time.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/calendario_judaico_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_f1156169f38f489b9c59945bb71b167f.pdf?index=trueIn PDF document text
    • http://wutesejib.onlinewebshop.net/kaworadonovedevexunugale.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_6136ee3fbd06412f848c497682384aaf.pdf?index=trueIn PDF document text
    • http://jekurur.atwebpages.com/matemason.pdfIn PDF document text
    • http://judomumofu.rf.gd/is_fossil_gen_5_worth_it.pdfIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_83bde60c5bbe4a1198826bc769a5402c.pdf?index=trueIn PDF document text
    • http://luvafavuma.rf.gd/malox.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_121b031a71194340a80db92ae7147a28.pdf?index=trueIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_c3a2199a349f413184389a5dc40633c4.pdf?index=trueIn PDF document text
    • http://witeguxatuzidaj.epizy.com/guide_dogs_for_the_blind_charity_details.pdfIn PDF document text
    • http://bovifuxabobi.epizy.com/vexesavogatixefap.pdfIn PDF document text
    • http://dowupozor.epizy.com/xokip.pdfIn PDF document text
    • http://lugukejuraxa.rf.gd/28356937569.pdfIn PDF document text
    • http://nidawumatori.rf.gd/70411231850.pdfIn PDF document text
    • http://zefexulipovi.rf.gd/78833004127.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_off00010866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 5632 bytes
SHA-256: d87f4f15f8c0d89aec14f05846552339063f82bac564a723259ea3ac13a6ee01
font_01_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0001240d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240D 10380 bytes
SHA-256: c11d2ba634fcd84cfd6034d68fa2061c92a16a50ddca2c42f1cb617c7e5cff89