Malicious PDF — malware analysis report

Static analysis result for SHA-256 78de9ccf170b5e77…

MALICIOUS

PDF

41.0 KB Created: 2020-11-09 00:13:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 8484d15a5392c8118d719d142cd79f09 SHA-1: 10d11084feb216d44131f68aa4a8b1b56d6d2c13 SHA-256: 78de9ccf170b5e77953389229cf468c87c5021c0f995ea633aa17b84f111e85b
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://traffset.ru/aws?keyword=adobe+premiere+pro+crack+free+download PDF link annotation
    • https://sukowaletudevux.weebly.com/uploads/1/3/0/8/130874669/a2a9fd03e3c.pdfIn PDF document text
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/841b1b.pdfIn PDF document text
    • https://tuwijojax.weebly.com/uploads/1/3/4/4/134477229/2799200.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/72cd1bfa-fe40-4e0c-a044-b4c2fe106002/dolebipagerugebopanidojit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc1231a-4fd5-4037-b93b-c188134631ed/81573116123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3c5e6c4-2761-41fb-be94-bd9778291ff8/1218613431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d260c4-b0ab-46ac-988b-a899f1bef265/kazowoxex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d6083c3-d6c2-407f-b873-78e1e2adac21/digital_product_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14a6dbf-3c7c-4c3f-8865-ee7a26a433c9/62618215864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3987d3a2-1e94-4e26-92d6-368c540ca58b/mastercraft_guide_pole_covers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d70494-8888-4831-a22b-495302c6a874/fichas_de_lectura_para_imprimir.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/8638498315.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_off00006083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6083 5408 bytes
SHA-256: 80473f9520bc93cc4c21d19be69e75e50fcc5b02b6972da9090524afdf593893
font_01_sfnt_off000072e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72E6 10552 bytes
SHA-256: 6f0fac6984573b5070ecf4fcae9db2f899c0b731c3f7fc6ef8900917e65212b8

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