Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5bf85c8ab8eb33…

MALICIOUS

PDF

83.6 KB Created: 2021-02-22 20:20:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: bedfd10c798c0e3c659dddc1bf17d5fc SHA-1: c8c8046ef7d8b4f48e7be4cff0a943c53e310ded SHA-256: 7b5bf85c8ab8eb3363d8d90669c56448cb2553231ae48e21271f8528c7a19c44
126 Risk Score

Malware Insights

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

The file is a PDF containing multiple embedded URLs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, which is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/123?utm_term=different+types+of+organizational+cultures+represent+opposing+core+values PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455884/normal_60153804e889c.pdfIn PDF document text
    • https://fadusibolene.weebly.com/uploads/1/3/4/0/134042843/nizawit-miligobedimem-ledisezilegim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492880/normal_602b4758c5f23.pdfIn PDF document text
    • http://mini-cam-v2.club/vodafuboniduruz9ul5o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5ff71151e1ded.pdfIn PDF document text
    • http://glossywp.online/42931106476ujnei.pdfIn PDF document text
    • http://tehnoprom.org/disubefak3je3.pdfIn PDF document text
    • http://findfreegirl.com/dell_5285_not_turning_on2vnvv.pdfIn PDF document text
    • http://lalashoppen.online/antioxidantes_20176pp77.pdfIn PDF document text
    • http://arfesopt.com/jukajodupotosug9cgo5.pdfIn PDF document text
    • http://nupubidodeje.22web.org/82509777075.pdfIn PDF document text
    • https://dodezugufiz.weebly.com/uploads/1/3/5/3/135331092/c5be4617d02c.pdfIn PDF document text
    • http://xasujaru.22web.org/sezewebetanokukup.pdfIn PDF document text
    • http://profyhouse.ru/effluent_regulatory_reporting_information_systemu8szz.pdfIn PDF document text
    • https://tesutubesonazi.weebly.com/uploads/1/3/4/6/134682982/7637033.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447101/normal_60075487906c6.pdfIn PDF document text
    • http://itanah.space/simejatedebanoviragwc60.pdfIn PDF document text
    • https://jajadonafusava.weebly.com/uploads/1/3/4/0/134040597/kefunoloneg.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/skillful_reading_and_writing_1_teachers_book79x86.pdfIn PDF document text
    • https://gumevimarijefa.weebly.com/uploads/1/3/1/0/131071167/1229885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sukasorepej.rf.gd/year_3_mental_maths_worksheets.pdfIn PDF document text
    • http://mudivufovibu.epizy.com/gavukewonevibibe.pdfIn PDF document text
    • http://lawuzuzadi.rf.gd/38676912288.pdfIn PDF document text
    • http://tirodubixuvix.epizy.com/fulamewifisoginawumukif.pdfIn PDF document text
    • http://sujemitusosida.epizy.com/meeting_attendance_form.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_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 5392 bytes
SHA-256: deef57aba3cef0c69002cdd65dbc6e921bf11ffb7fef0ae9e81bf4d7f8a870fd
font_01_sfnt_off000119c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C5 10588 bytes
SHA-256: 35c4a3f758bf25bdb9b72ffc5ef8c8724ae2bf48fb2d4cc6792df10b66674491

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