Malicious PDF — malware analysis report

Static analysis result for SHA-256 8287817efea71883…

MALICIOUS

PDF

75.1 KB Created: 2021-03-31 12:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b2e037a73b1d4c0e1ae7cea24934bc6d SHA-1: cc8974e499bc98f57820272c8bc6bcf50a7beca8 SHA-256: 8287817efea71883702f15b01ae33d162e0904d011f6b83dcaea90905ca018e6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. No scripts were extracted, but the presence of multiple external URIs points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=blink+to+speak+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370074/normal_602da2f97dc4c.pdfIn PDF document text
    • https://muxiduxipa.weebly.com/uploads/1/3/5/3/135319221/botaxu-zifudon-gizosubilar.pdfIn PDF document text
    • http://igme.site/60268066422p639y.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/afsar_punjabi_movie_full_hd_720p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497370/normal_603d32a06d769.pdfIn PDF document text
    • https://rixorololexapi.weebly.com/uploads/1/3/1/8/131857390/jodezijozofi_bikobepasiji_peraratevot_zubolebukowuwib.pdfIn PDF document text
    • https://korudodigujoko.weebly.com/uploads/1/3/0/7/130740169/de7e4d06b04db6b.pdfIn PDF document text
    • http://gayerkan.com/3332192419eag9h.pdfIn PDF document text
    • http://hristogrigorov.com/425048671570e0au.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5ffd82a2a715f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_6025b07b43fc9.pdfIn PDF document text
    • https://livaganomin.weebly.com/uploads/1/3/4/3/134399079/sefoxujagug.pdfIn PDF document text
    • http://zitutetek.22web.org/67121038730.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://ratesedefavure.epizy.com/technical_report_template_uk.pdfIn PDF document text
    • http://tasebofav.rf.gd/clinical_anatomy_of_knee_joint.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/library_management_system_excel_template.pdfIn PDF document text
    • http://sudiwoke.epizy.com/financial_management_excel_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/fifigefojuwofin.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/does_blue_cross_cover_couples_counseling.pdfIn PDF document text
    • http://pijipareti.epizy.com/acofp_inservice_exam_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/mupafobigitobuwebaruzuta.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/bawitij.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_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 4980 bytes
SHA-256: 168fa45400fd9125023d7ad50dcfb8184a84c2d60354266ada58081f632fbb84
font_01_sfnt_off0000e98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 11148 bytes
SHA-256: 1b10dd63c19acaf749331f59c6d6096d9270ab799a7dd6a431dfb07e7d84fd38
font_02_sfnt_off00010f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F79 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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