Malicious PDF — malware analysis report

Static analysis result for SHA-256 a437c6495d7ba645…

MALICIOUS

PDF

95.9 KB Created: 2021-03-05 10:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 55f1c758d0ef3e78d7777f3c8bef6cb7 SHA-1: f5e7a85d0a7cea57449121843e9ebb56f9c0e016 SHA-256: a437c6495d7ba645fb658993cb146196be7cc1182748cf4063f2089510a5e964
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious. It contains numerous external URIs, with one notable example being https://ponafet.ru/123?utm_term=how+to+put+needle+in+sewing+machine+singer, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for a large number of links, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ponafet.ru/123?utm_term=how+to+put+needle+in+sewing+machine+singer PDF link annotation
    • https://cdn.sqhk.co/jarixizotib/Vpiex4S/23474055603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492600/normal_601f1ecbafd5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_603a5db15f3e7.pdfIn PDF document text
    • http://znalomstvavip.site/xegazasogisazifoxovexg8zlv.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/Q27Ddii/nitefujewupepuniv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483345/normal_60172dcb381ca.pdfIn PDF document text
    • https://cdn.sqhk.co/desiketomasu/oSgdjg2/wevobetirudoza.pdfIn PDF document text
    • http://lg-copyrightforms.com/what_are_the_pillars_of_the_earth_in_the_biblejcw60.pdfIn PDF document text
    • http://blankid.ru/what_does_space_mean_in_interior_design9uqkn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_603262e25401d.pdfIn PDF document text
    • http://erogan-encolumbia.site/72195864259yxhro.pdfIn PDF document text
    • http://dmdmassage.com/xatigexuzanoxelugogeseisdk0.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
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_7f9869034531477ca38bb655fb008c6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2267465-c972-4cee-bfc8-4e8d808ba952/pujovesom.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_a253e5f358894af7b9910184d01617fc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1dfaa13-be27-4083-88b5-7f09cee8c316/solabapaviguvabawito.pdfIn PDF document text
    • http://releboxodaw.rf.gd/21363651557.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_67cd3aca6df545dd8922636454f1cc83.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2399cb49-c00d-477d-88b6-1a74cd7e841a/ejemplo_de_manual_de_procedimientos_de_una_empresa_de_servicios.pdfIn PDF document text
    • http://zifenefumob.rf.gd/does_chai_tea_stain_your_teeth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83752d49-0314-452a-8c02-2b6ef63a4fe1/jozavusesawegetemipilot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd32f4a9-b6a1-4693-b131-5df718ea9968/17711891210.pdfIn PDF document text
    • http://wigikel.rf.gd/94411023375.pdfIn PDF document text
    • http://bavabime.rf.gd/80503509500.pdfIn PDF document text
    • http://tuzodunewawet.epizy.com/dream_girl_movie_free_torrentz2.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_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 5424 bytes
SHA-256: ac517782eff14f85c358eddf4de8e8960ded8e06707ef1f77d5d749362d82b87
font_01_sfnt_off00013ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA8 10748 bytes
SHA-256: 88a9c674281f975fd41c455ee69d22e18af5a4803d794acd52c4afb9093541f3
font_02_sfnt_off0001634e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1634E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34