Malicious PDF — malware analysis report

Static analysis result for SHA-256 512a4e366b545c28…

MALICIOUS

PDF

119.3 KB Created: 2021-04-30 01:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9b7e3e5094cc7259ffef8213e1fe9884 SHA-1: 1140fc703c4a94890e74bd210f62b8911dd460d4 SHA-256: 512a4e366b545c28cd06225fedef7b2c60c160d373484e78bd856026baeef50e
134 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a phishing or malware distribution scheme, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/strik?utm_term=how+to+train+your+dragon+film+4+intro PDF link annotation
    • http://jirusulixozome.scienceontheweb.net/spalding_44_portable_basketball_system_reviews.pdfIn PDF document text
    • http://govuled.mywebcommunity.org/cover_letter_template_for_job_application.pdfIn PDF document text
    • http://luxibenuguk.getenjoyment.net/audit_externe.pdfIn PDF document text
    • http://milanomoda-italy.site/duneselesonajuropuvexesaduscg0.pdfIn PDF document text
    • http://tanolugulutewu.medianewsonline.com/cisco_dpc3825_cable_modem_with_wifi_configuration.pdfIn PDF document text
    • http://moxawunanenubop.sportsontheweb.net/accounting_executive_job_description.pdfIn PDF document text
    • http://dexiserabasavo.mygamesonline.org/pdf_to_jpg_converter_software_for_pc.pdfIn PDF document text
    • http://kugewezebuvigiw.mygamesonline.org/binocular_microscope_parts_and_functions.pdfIn PDF document text
    • http://instasurprise.online/chronological_order_of_marvel_movies_imdbsv38s.pdfIn PDF document text
    • http://nipijapogila.sportsontheweb.net/958674103.pdfIn PDF document text
    • http://vuwiwetidajin.mywebcommunity.org/doxuxon.pdfIn PDF document text
    • http://palawawez.mypressonline.com/assessing_listening_skills.pdfIn PDF document text
    • http://mogimetekojubar.scienceontheweb.net/besame_mucho_classical_guitar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc56c92-4924-47c5-a462-7e1c6db51b31/derechos_humanos_en_estados_unidos.pdfIn PDF document text
    • http://zijurape.atwebpages.com/47769463974.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a113c7fd-0f21-4e55-9cf6-e90cb52d51d5/sword_art_online_anime_list.pdfIn PDF document text
    • http://gozudil.onlinewebshop.net/biological_anthropology_4th_edition.pdfIn PDF document text
    • http://bitines.myartsonline.com/40308573633.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_off000198cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198CF 5292 bytes
SHA-256: fdd08970e48ade814a4d5b48a1f7be2272247f9e59fb047e14cb692dfe4a8941
font_01_sfnt_off0001aad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAD9 10800 bytes
SHA-256: 4ec6e9959a8ff90d9d124ec371ece9e2fd3f1dd13093469b07852f1bd6ce3c0b

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