Malicious PDF — malware analysis report

Static analysis result for SHA-256 66427dd05f6f3ac8…

MALICIOUS

PDF

80.4 KB Created: 2021-03-31 02:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 8026ba52dcd11fa7aa975d5551ac8556 SHA-1: e2cb9a5bb592fc5a478d25f85e69df5c477ed7f3 SHA-256: 66427dd05f6f3ac8c7800f19e0caa86333b60127fe81025b1a205945ba708857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The embedded URLs, particularly the one to `midufefew.ru`, suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and the presence of numerous external links point towards an attempt to exploit vulnerabilities or redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=basic+ukulele+chord+chart+for+beginners+pdf PDF link annotation
    • http://snatural.space/jadunafowuwinudipujumotadoraq.pdfIn PDF document text
    • http://jenewazajasazu.getenjoyment.net/mustang_owners_museum_moving.pdfIn PDF document text
    • http://dreamingdeveloper.com/91028045960twbs9.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/algedonic_rh_sin.pdfIn PDF document text
    • http://centerverifybadge.com/in_what_order_should_i_watch_the_lord_of_the_rings_and_the_hobbit34in8.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/ley_de_ingresos_del_municipio_de_puebla_2019.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/domegagowevag/android_bluetooth_multiplayer_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/20598223580.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/hip_hop_dance_stunts_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/10651214497.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/kuxizojoz.pdfIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_856daa3e3d7a41419a6b6d3b0ca9bd48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/3dmark_terbaru_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/fonts_for_android_apk.pdfIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_8413030e356b4678ade8712e01d89ad4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kewakuko/kuzoxexitafenafe.pdfIn PDF document text
    • http://kifesafijupesob.onlinewebshop.net/1338913986.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/nerinujotupufa.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_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 5672 bytes
SHA-256: 3671fb9dd7eed348d8f70626803d1f8f1e59d9582c32813607357f37b6f5d8f7
font_01_sfnt_off0001106e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 10416 bytes
SHA-256: 86ae3777840668bff7fa5257e36606e9a009be57ce57b92a60c9cd8cb7ef811c

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