Malicious PDF — malware analysis report

Static analysis result for SHA-256 11633673f8f4b877…

MALICIOUS

PDF

78.7 KB Created: 2021-03-01 23:28:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 453a8b8f890249602ce13b04351d0e27 SHA-1: 2a4cf48b0f48fce3b86f9712787ed1d9f6a95406 SHA-256: 11633673f8f4b877f5597fd67a8280d41271e65d927c750d6bb1650d2bcb2453
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, many of which are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=obra+la+culpa+es+de+la+vaca+resumen PDF link annotation
    • http://sevezor.scienceontheweb.net/how_long_for_baby_to_get_in_deep_sleep.pdfIn PDF document text
    • http://linogozajasupe.22web.org/20539722342.pdfIn PDF document text
    • http://cardioactiveufficiale.site/the_accountant_full_movie_400mba1x9s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_601627ac8dbb6.pdfIn PDF document text
    • http://xakugitanaz.iblogger.org/midodudegir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466154/normal_6018a142dd35d.pdfIn PDF document text
    • http://flowerport.store/507535130154scrq.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/ladifojadoralosis.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/bissell_proheat_advanced_carpet_cleaner_25a3w_manual.pdfIn PDF document text
    • http://wulodab.iblogger.org/bacon_lettuce_tomato_sandwich_nutrition_information.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486748/normal_5ffabeb4dd826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454556/normal_6016fb2aa597c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502248/normal_601ae4b9da093.pdfIn PDF document text
    • https://zupuluduwiwafop.weebly.com/uploads/1/3/2/6/132681460/salujawu.pdfIn PDF document text
    • http://jushq.club/goldstone_report_israelyp0e0.pdfIn PDF document text
    • https://nolilozeto.weebly.com/uploads/1/3/5/9/135957670/rixonekix-xerasevun-legame-wipufaro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nelenubo.rf.gd/bteup_scrutiny_form_2019_jobriya.pdfIn PDF document text
    • http://fosarasopu.rf.gd/is_tokyo_ghoul_appropriate_for_an_11_year_old.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/wahl_clippers_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/harp_sheet_music_hallelujah.pdfIn PDF document text
    • http://kugukokoner.myartsonline.com/mefape.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_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 5448 bytes
SHA-256: 2b3e7436149d235f24f0d4ce3024160406afca31d897b43e165d981bacf1fe30
font_01_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 11704 bytes
SHA-256: 9bbb2f1d1cf7999d22207958b4b66ef68da46bc39b4d4ccaa54234dd934561df

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