Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cdfe632a70913b…

MALICIOUS

PDF

77.1 KB Created: 2021-02-24 18:29:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 69104507335bad39a8a6b101cae15a59 SHA-1: 084a4850037379cba042b010cfcc652e5581d148 SHA-256: 86cdfe632a70913b270052f2ce9706ed812df8490e02d3097d9ddc2424800746
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further payloads or conducting phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=straight+line+graphs+worksheet+pdf PDF link annotation
    • http://3203epworthcres.com/plagiarism_detection_program_freegosvg.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/muvubenekofuwuzodo.pdfIn PDF document text
    • http://wisecreditscore.info/72260337843po64d.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/41975938448.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/what_does_color_black_represent_in_bible.pdfIn PDF document text
    • http://ruwegekugite.22web.org/gejoxatukinif.pdfIn PDF document text
    • https://motodamoz.weebly.com/uploads/1/3/1/4/131452818/59914.pdfIn PDF document text
    • https://wilasumoleliwu.weebly.com/uploads/1/3/1/4/131414134/8793201.pdfIn PDF document text
    • http://pubgucbayim.com/nixuwivoxaxosub37y6.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/descargar_audio_biblia_reina_valera_1960_mp3.pdfIn PDF document text
    • https://jafufikatovovew.weebly.com/uploads/1/3/4/4/134481731/majinojurufuw.pdfIn PDF document text
    • https://jejaparax.weebly.com/uploads/1/3/5/3/135332208/kifofepafevome_kowiremu_tutuwigefumopaw.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/87662354558.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fobonerenajob.epizy.com/luxury_travel_guide_awards.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/mental_status_examination_form_free_download.pdfIn PDF document text
    • http://bitines.myartsonline.com/bujirifixufokanaga.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/roomba_560_manuale_italiano.pdfIn PDF document text
    • http://kepafikan.rf.gd/dissertation_report_on_finance.pdfIn PDF document text
    • http://kopixagelaje.rf.gd/41637875166.pdfIn PDF document text
    • http://pudunajuge.rf.gd/kofefujapodukigow.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/how_to_use_the_sodastream_spirit.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_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 5560 bytes
SHA-256: 904db32edb9fdb4d921bbf20afd15f8ebf40c75fe6c46fb1db8d43ea89a08aa7
font_01_sfnt_off00010309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10309 10572 bytes
SHA-256: 41932c1705fd775aa0daa9133996ab4e263d918878685d53efdb298f7b0b7cef

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