Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea9c6bd2b9f08cf3…

MALICIOUS

PDF

85.1 KB Created: 2021-02-25 01:33:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f8c48ce4818362765440cb9d782bdd56 SHA-1: 7812ccb8be1e53d5a3fcd8d451a3fa830e01aa31 SHA-256: ea9c6bd2b9f08cf3e6961e2458979c8decd19ba1acd3b1a567ec4c85b49c5da7
206 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document contains numerous external links, many hosted on disposable domains, suggesting an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the PDF structure and link farm heuristics point towards a phishing or malicious redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=boy+in+striped+pajamas+movie+true+story PDF link annotation
    • https://cdn.sqhk.co/fegadosijete/hfijaid/putuzixitiwupuxoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/naxudufejik/iaAhewc/arcade_2002_old_games_unblocked.pdfIn PDF document text
    • http://fortuneo-enligne.com/36561985492c0zan.pdfIn PDF document text
    • http://lavka-karamel.ru/cessna_172m_parts_catalog9whs6.pdfIn PDF document text
    • https://cdn.sqhk.co/desixurate/edYdsVV/86062109520.pdfIn PDF document text
    • http://sberbank.services/al_waseet_bahrainiz7bs.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/2KNThjc/live_chat_rooms_mental_health.pdfIn PDF document text
    • http://hookup750.website/lurelijakatsubvu.pdfIn PDF document text
    • http://accface.in/the_wrath_and_the_dawn_series_how_many_bookskcitx.pdfIn PDF document text
    • http://theandyhong.com/71674810438gffl0.pdfIn PDF document text
    • https://piturerakilapes.weebly.com/uploads/1/3/0/7/130775197/8131968.pdfIn PDF document text
    • https://cdn.sqhk.co/kenujowemi/hidvfie/pixel_recorder_app_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/idhayha/62060523914.pdfIn PDF document text
    • http://myyshooop224.site/denon_avr-589_hdmi_audiogrmc6.pdfIn PDF document text
    • https://cdn.sqhk.co/degavorofala/jbjjicQ/kusuriv.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/jboPfgg/learn_html5_and_css.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 5360 bytes
SHA-256: 15b9aa777cdbae722b2c5148a5ecbef13d641cedd4304811fb5ee1c11276cfe3
font_02_sfnt_off00012017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12017 11184 bytes
SHA-256: d27ed554452f72efaf506d7a769f6206b547f2303152201c079bfa2ccb9aa9d2

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