Malicious PDF — malware analysis report

Static analysis result for SHA-256 d51b30a22ba0aba2…

MALICIOUS

PDF

37.0 KB Created: 2020-11-09 12:59:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: f2073dbbd28d5c124e7f68e0e95862b6 SHA-1: f5e77c41b4afaa19f304af34cc8af78a0d733920 SHA-256: d51b30a22ba0aba2fc28734451edcd32e6c75573b447cbdc5a96562d7006d7a7
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/123?keyword=total+gym+owners+manual+2000+3000+xl+and+xls PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402710/normal_5f96e43f8da16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5fa8aee914019.pdfIn PDF document text
    • https://jovikuveditowe.weebly.com/uploads/1/3/0/8/130874612/3602458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_5f9f31fce8c92.pdfIn PDF document text
    • https://vidimepimexuja.weebly.com/uploads/1/3/4/6/134626803/8530532.pdfIn PDF document text
    • https://xabolagusi.weebly.com/uploads/1/3/4/6/134631680/e8b34088b0ff6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f8b3c8fd22fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_5f988c567e9bb.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/64137fa2-c6ca-4e3b-ab7b-f8aaa314fc67/rosiwifuku.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/apple_apk_downloader.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/86859036261.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/fahrenheit_451_epub_download.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_off00004eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EFF 5792 bytes
SHA-256: 7397f22c33a7107d52fe7056cef630a32dcb0ce935aa33dd1a59f7311dd5898c
font_01_sfnt_off000062ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62BA 10768 bytes
SHA-256: 6afa96bad1c85a470e22c268a0a499f8a614556837c86bbd892db15096f8e486