Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e8cf5ff1a694ae…

MALICIOUS

PDF

68.0 KB Created: 2021-03-14 01:07:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cf7987692bd9254fb76857cf444ba46a SHA-1: 9f24071b32dce0c2a34ccbaca56caf2f26890998 SHA-256: 08e8cf5ff1a694ae8d80a05ad79d0dcb2accd25defb7c418636b82dfae817cca
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/award?keyword=old+macdonald+had+a+farm+ukulele+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416928/normal_5fc5e534ad1f8.pdfIn PDF document text
    • http://bepelisufozasep.mywebcommunity.org/activities_to_improve_listening_skills_for_kindergarten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_6038b624b893e.pdfIn PDF document text
    • http://xudiremomikuxe.iblogger.org/pijaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_603541ff629b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379217/normal_6030470ba1ae8.pdfIn PDF document text
    • http://bidetoluji.getenjoyment.net/devometudisolude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476767/normal_6031cd3e09f89.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/how_to_setup_scan_on_hp_officejet_4630.pdfIn PDF document text
    • http://pubgucbayim.com/arch_linux_install_packagefdakk.pdfIn PDF document text
    • http://titoto.xyz/modern_cabinet_making_5th_edition9kdfu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_6021d841b1aeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471691/normal_5fdc60f12926e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408997/normal_603c1987d3787.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/python_range_vs_xrange.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478132/normal_6000b1716bf9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484624/normal_6028b8f55c112.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_3d5ba90a278249369aaea94c52e95ec3.pdf?index=trueIn PDF document text
    • http://pejinubonuxus.epizy.com/tujubarafesaxuju.pdfIn PDF document text
    • http://lafeseg.rf.gd/diablo_3_season_14_class_guide.pdfIn PDF document text
    • https://0bef8565-087b-457a-960c-b0529baba50c.filesusr.com/ugd/638000_6aca9e25de3248bb8bbdd48a93d0cb3d.pdf?index=trueIn PDF document text
    • http://rujidafedisezu.atwebpages.com/name_the_three_main_types_of_intermolecular_forces.pdfIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_d9450b21108a499c8dd5143682e18ab8.pdf?index=trueIn PDF document text
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_ac4a663dd31c45968cb9db87bccd3211.pdf?index=trueIn PDF document text
    • http://fatasadobapur.epizy.com/frigidaire_affinity_front_load_washer_clean_drain_pump.pdfIn PDF document text
    • http://gumelojapa.epizy.com/white_wood_platform_bed_twin.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_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 5308 bytes
SHA-256: 2485ca89545768d0b86afbeab38c0ae26df0838892aa84ddb139a9d42624f65f
font_01_sfnt_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 10156 bytes
SHA-256: d81936ee9cc9eb0b24e0cd70fb9552ca8d67ffd51806c5462b991fc37e3b6176

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