Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9908c66722388e5…

MALICIOUS

PDF

36.6 KB Created: 2020-11-08 13:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: b2cf6942df8909b3bcf899eee9a00a04 SHA-1: 6220828a7ddf0bf01957a123822555e7a8a3b453 SHA-256: d9908c66722388e572809cd9643f4b1fcc28dbd64fcf2c6f611467a3ab364c31
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://traffset.ru/aws?keyword=avr+studio+6 PDF link annotation
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/pinanaxokizinuk_motakikowutezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_5f93157b77545.pdfIn PDF document text
    • https://sekojufakov.weebly.com/uploads/1/3/0/7/130776719/0a5fb7a2ffa188b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5fa5b2a1c8d2f.pdfIn PDF document text
    • https://sonujesenusa.weebly.com/uploads/1/3/4/3/134344018/bumizorifakazapuziwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475987/normal_5fa575be35eb7.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kelezejurijiru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382958/normal_5f8d8af4aba22.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/20cf88f4-016b-4167-b4cc-2d32deff5c7b/kivab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d54a58-7257-46c8-904d-843103094724/paduwutepanakejote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e046a5-2a5b-4f48-8541-dabeb83f7d63/70402594244.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_off0000521f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x521F 4780 bytes
SHA-256: 26e91b02f2602b5305315af8fdc65253320e946f393fb61c736eb6ebb4309c7f
font_01_sfnt_off0000627a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627A 10472 bytes
SHA-256: 76941dc5b98efe1d60f3fad86e32ecb6ae13287f7f8689d5c655cc8203c55f84