Malicious PDF — malware analysis report

Static analysis result for SHA-256 be171bf360c2fb07…

MALICIOUS

PDF

95.6 KB Created: 2021-04-26 00:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2b1000f9b615be15aba9091bc7daf67b SHA-1: 271b2b371795b0a7e4b6defb3c9bf81e5995fe00 SHA-256: be171bf360c2fb076c35123675614811c79b7ebd4e012aa612f608e8c7d94a2c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to educational content to entice users to click on the malicious links.

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://pelibifir.ru/strik?utm_term=ejercicios+resueltos+de+limites+de+funciones+exponenciales+y+logaritmicas PDF link annotation
    • http://nomanodix.iblogger.org/bernardo_stamateas_libros_emociones_toxicas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369506/normal_5fc67e6cb7506.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/99789879549.pdfIn PDF document text
    • http://organic100.fun/59431811778qequt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498971/normal_6056ae8f779c4.pdfIn PDF document text
    • https://nudikiwo.weebly.com/uploads/1/3/4/0/134042489/xoxuzulora_wujimibuteso_buweno_japesatogoximam.pdfIn PDF document text
    • http://poverkavoda.website/rascal_pioneer_mobility_scooter_reviewszk5zw.pdfIn PDF document text
    • http://vugaganopofom.mypressonline.com/kefapuzibawe.pdfIn PDF document text
    • http://pimolala.22web.org/colliers_milwaukee_office_report.pdfIn PDF document text
    • https://sozejelef.weebly.com/uploads/1/3/4/6/134600180/bojenadexifowenexer.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/vinuliwuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426942/normal_606017ba1dd63.pdfIn PDF document text
    • http://onesmall.space/kenojabomifatasigixv.pdfIn PDF document text
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/fojagawafazivitomoz.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://uploads.strikinglycdn.com/files/f77c55e5-2b6c-44a4-b033-a5ad764c13c4/30245526874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/decf3175-d64e-4f9a-8a62-12ae13ff6790/dabezaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f5fc751-0a63-4a73-920d-e6631ffc225c/79394317032.pdfIn PDF document text
    • http://vuripoda.epizy.com/29387116866.pdfIn PDF document text
    • http://bimuvugibane.rf.gd/puziroxirilojowaxiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0261581-5019-49f9-8be4-467bb56b4de8/essential_organic_chemistry_3rd_edition_test_bank.pdfIn PDF document text
    • http://tulazupuvive.epizy.com/28163159604.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_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 5560 bytes
SHA-256: 11a8a61dcaab56f61466499060af36aaad21090939e5dd8b3c9be1c6e141da61
font_01_sfnt_off0001356c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356C 13088 bytes
SHA-256: da5cedd8c761f92a4fcd786acc88b15b7ea0f96a2e929a10b06e6d1b516b89f2
font_02_sfnt_off00015f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F98 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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