Malicious PDF — malware analysis report

Static analysis result for SHA-256 213b29cee7913c48…

MALICIOUS

PDF

90.6 KB Created: 2021-06-13 01:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e2dfd61c378aff921e2217586e6475e2 SHA-1: 3d1b5b22b841bd8dfa671fc379c0b1066a01aa4b SHA-256: 213b29cee7913c4872c405e151af4fd5582f98bedc262c995ca3b64c2d3216e1
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'ketchas.ru', suggesting a redirection or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ketchas.ru/pbw?utm_term=the+tom+and+jerry+show+the+tom+and+jerry+comedy+show PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383922/normal_606b1dfe3dc27.pdfIn PDF document text
    • https://lamosovi.weebly.com/uploads/1/3/4/6/134600354/381429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_603fdb543ccaf.pdfIn PDF document text
    • https://fotizewuzawefuv.weebly.com/uploads/1/3/4/6/134668380/2036020.pdfIn PDF document text
    • https://zodosixuwe.weebly.com/uploads/1/3/4/8/134863902/e847f1f24a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367944/normal_5fee82898cfd3.pdfIn PDF document text
    • https://botugesoxa.weebly.com/uploads/1/3/4/5/134509905/titojuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_6020392414ff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379363/normal_602bdcf1d7895.pdfIn PDF document text
    • https://vexepediv.weebly.com/uploads/1/3/4/6/134668456/xabomifujid_rezarudabisok_bisib_fujomuvapu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454561/normal_5fcbc110a03c0.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/kivewovuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473432/normal_60bc483cef9ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503787/normal_605b0e48854a6.pdfIn PDF document text
    • https://ziperivowupidu.weebly.com/uploads/1/3/1/3/131381589/5209672.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
    • http://wemekojezum.pbworks.com/f/download_imvu_mod_apk_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3fea09-6816-4d10-8134-6bdad4adc487/cuanto_tiempo_puedo_llevar_el_carnet_de_conducir_caducado.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/w/file/fetch/144744390/how_to_reset_crestar_fan_remote.pdfIn PDF document text
    • http://sejiliki.pbworks.com/w/file/fetch/145213671/30135687553.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/17474804342.pdfIn PDF document text
    • http://nefusim.pbworks.com/f/peter_cardon_business_communication_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a79a6963-d396-45e6-a2dd-6189d293c1e0/chaos_magic_dnd.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_off000113df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DF 5104 bytes
SHA-256: bf9b6bccff9f831e977b9fc8e1193cca77d01fc6146874520c2af0a63edd1b1d
font_01_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 12088 bytes
SHA-256: 35bedac22f4c91e75589ae3a08d59bf482a0fee51044f3a4b7b2517f7564abb2
font_02_sfnt_off00014c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C92 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71