Malicious PDF — malware analysis report

Static analysis result for SHA-256 8966f932db8c8f8f…

MALICIOUS

PDF

73.8 KB Created: 2021-04-05 23:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a64fd7e73530ca71bc9c6ea23cc9c121 SHA-1: 940ca75ee7c3a88d6545960944122bfb9ad9afab SHA-256: 8966f932db8c8f8f8f2f19fb4bcc7e8af9cbf40e755acb2f3f266cf1f2ff3176
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically directing users to 'dafemum.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's purpose appears to be phishing or redirecting users to malicious content, likely to steal credentials or deliver further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=password+protect+your+google+form In PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_6051930fa3dee.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/fixavuzeponigamidogazosul.pdfIn PDF document text
    • http://megikinazemurel.22web.org/excel_proforma_invoice_template.pdfIn PDF document text
    • http://sendgrid-de.com/what_is_captive_mean_in_the_bibleriuie.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467979/normal_5ffa13d5c1a5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482882/normal_6027336902918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500877/normal_605f57066d257.pdfIn PDF document text
    • http://afracheat4.xyz/70705308794c67x5.pdfIn PDF document text
    • http://xelasurugopu.mywebcommunity.org/redufabusafutimafodiru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejifavo/89378289201.pdfIn PDF document text
    • http://sazebufaz.atwebpages.com/44182154314.pdfIn PDF document text
    • http://befadiw.rf.gd/mugagukudijifokipejimapa.pdfIn PDF document text
    • http://tinorojuneguj.rf.gd/fuxotudogatabenumotek.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/guwozilotelamunufur.pdfIn PDF document text
    • http://tofegegumenoz.rf.gd/english_kannada_dictionary_download_free.pdfIn PDF document text
    • http://pumajuxav.rf.gd/cuantas_calorias_se_debe_consumir_al_dia_para_adelgazar.pdfIn PDF document text
    • http://ramejepazino.rf.gd/laundromat_business_plan_sample.pdfIn PDF document text
    • http://fubolorira.epizy.com/free_photoshop_cs6_for_macbook_pro.pdfIn PDF document text
    • http://luwegovufa.epizy.com/bums_syllabus_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/fexizolinesifiro.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_off0000e0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E3 5672 bytes
SHA-256: f9da672245978a3c0b7ba780b7aea92a1b6752692b93f0bffa9aae4b062d4990
font_01_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 11048 bytes
SHA-256: 4353bdb93f2f38c5044f3e3e4ffe9345de7771bdfe371272b0c2641004d08672

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