Malicious PDF — malware analysis report

Static analysis result for SHA-256 81338f4b05aba9e3…

MALICIOUS

PDF

43.9 KB Created: 2020-11-06 23:02:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: c8103ea0c23ecf5d4f994c9ed67bd4b2 SHA-1: 7748116e6871400a3cea2f78c402d6612c085484 SHA-256: 81338f4b05aba9e361102741cbd8a30bf1d00ee4a9f8056bf082a640d54ef324
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?keyword=patience+wright+dar PDF link annotation
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/1318354.pdfIn PDF document text
    • https://miwujiloj.weebly.com/uploads/1/3/4/3/134333625/9192683.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/9489200.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5fa56405ec4b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_5fa0a50f2e47b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f89e5d4c3f17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5f8aaeaca5aae.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/82f824ba-82c4-4cfc-9b6d-3d68a7777c01/dogiselumiwobufume.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/gopiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b1a9d0-4fae-450b-a3e1-964159c8f32a/interjection_worksheet_for_class_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41f76a86-bfef-4414-acb7-6fed71a0d5d4/43204485844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb7b3a79-7526-4416-b519-e2ef6fa43f1f/85062937188.pdfIn PDF document text
    • https://zukujevi.files.wordpress.com/2020/11/platformio_esp-_idf_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f0afd3a-7af3-472b-bf56-7bb5fa58b103/wack_your_ex.com.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b8df30-84dd-4584-a31a-677a3183c48e/77381121191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/033aeeb0-51d0-438d-b94e-26ab4a9cb705/63328391104.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_off00006c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C14 5084 bytes
SHA-256: f5fbb08ff49221e73b62f297744e90af3cff5195af3f489c5ba48edd21c54778
font_01_sfnt_off00007d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D65 10988 bytes
SHA-256: ad9227423613f02bd7580fdaadd04d475197b2c52b9f725456afcc6aa333567a

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