Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bde104e91f0052…

MALICIOUS

PDF

40.4 KB Created: 2020-10-10 09:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: fc7c7931d88badacf433795fdec44fe3 SHA-1: ad9bb794613908fdffc3c3526cb752e2490506b3 SHA-256: 35bde104e91f0052af863d25ca2e65222dbee60a202a5ec9ed53677160ecbe4e
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/strik?keyword=conference+call+auto+dialer In PDF document text
    • http://files.poiseaussies.com/uploads/1/3/0/8/130874110/wajededuwuv.pdfIn PDF document text
    • http://sebolijig.southshorecruisingclub.com/uploads/1/3/1/8/131856427/zekerularixi.pdfIn PDF document text
    • http://files.tampabayukulele.com/uploads/1/3/1/6/131606835/46533e8c5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0242/9092/files/dimiwagosasota.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4695/5929/files/dagitanabubom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/writing_naming_ionic_compounds_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0128/2711/files/76651424545.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0775/2866/files/45470161003.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/2828/7127/files/sorrel_horse_tack_colors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5152/0678/files/26170704158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9364b524-fc86-4e4d-8259-df26dc543cc3/10903380249.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19dd73b8-9466-41bc-9920-a787bc089cce/pizudubidokabikog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bea675c-6402-431b-adca-c4d85caa2b94/datemunesanupedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30ec7350-fc96-45f1-af2d-2b5d6548b745/97437881041.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_off00006250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6250 4740 bytes
SHA-256: d79afc2d8bdc40c4f80118352ba62d4b5728bf387cba3761b8a85f8b03c09547
font_01_sfnt_off0000727b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x727B 10080 bytes
SHA-256: 66a37892f63b03c735905cb456b8f5945a4486ae4a766823dd136bd1ac165458

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