Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad8d35209e8ffeb…

MALICIOUS

PDF

41.2 KB Created: 2020-10-12 17:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: fc475ef3a301c877190fff6281908035 SHA-1: 60e6cfdc83cc3889beb8108cc2f6b0658cbbe368 SHA-256: 5ad8d35209e8ffeb85511346c8c73f58de183c54a97ba1f606a1b33da0bc3c29
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=noun+forming+suffixes+pdf In PDF document text
    • https://site-1048172.mozfiles.com/files/1048172/93112880726.pdfIn PDF document text
    • https://site-1044240.mozfiles.com/files/1044240/95859389652.pdfIn PDF document text
    • https://site-1037125.mozfiles.com/files/1037125/36562599904.pdfIn PDF document text
    • https://site-1037115.mozfiles.com/files/1037115/pexur.pdfIn PDF document text
    • https://site-1039398.mozfiles.com/files/1039398/93282477736.pdfIn PDF document text
    • http://defopinor.carlislekidshouse.org/uploads/1/3/1/6/131636719/ad12da2c5d.pdfIn PDF document text
    • http://buruza.elizajanegilchrist.com/uploads/1/3/1/3/131381675/sevusuli-tulowure.pdfIn PDF document text
    • http://kusumutav.alexlanshe.com/uploads/1/3/2/3/132302870/db7f4c014.pdfIn PDF document text
    • http://loduzuduf.joelwbarrows.com/uploads/1/3/2/7/132712354/8325723.pdfIn PDF document text
    • http://files.faithquestionsandanswers.com/uploads/1/3/1/4/131452801/7034711.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/1/0432/8528/2980/files/driver_license_division_farmington_utah.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9945/3608/files/voxapodim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7157/2634/files/oak_for_less.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1666/4734/files/piwejakunujutafabezisin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1335/6194/files/drawing_moon_phases_worksheet.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_off00006489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6489 5156 bytes
SHA-256: 6604aab28498606ec9f8de443088651487fbeab6b120dfc54f80c077a1f6cde3
font_01_sfnt_off0000760c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x760C 9928 bytes
SHA-256: c7c18ce79915bbdb5619c66804b8e77b09da8be4b2582386edfe22a783926c90

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