Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b33015ac6913796…

MALICIOUS

PDF

38.0 KB Created: 2020-11-09 09:18:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: e35d963a5bbe89b8ae50f704158fb2e6 SHA-1: 74b8d86329727b4a4ca52431ec9f1b9b5a668513 SHA-256: 6b33015ac6913796be8a11264c908d64c583bb39ef75a8dc22132301b87d0b91
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://trafffe.ru/aws?keyword=skam+season+2+episode+8+english+subtitles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379615/normal_5f9ce7bccce0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374379/normal_5f91a7df6a45d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vilikati.files.wordpress.com/2020/11/xifukanemiliropiveredif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8730373a-6973-4044-b337-c3230abb9179/jepesizajumixomuf.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/usb_to_aux_cable_argos.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/ramanichandran_novels_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37eef02b-fad4-4a8c-8df4-3576cc0a9f7b/gunanowese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c040e028-8fc7-4c30-84b5-52c7bb7d0ef4/rates_of_reaction_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/83716796172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a435c1f-5a61-47d7-94d9-a687f28b7afa/33366388030.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/download_ps3_games_free_on_ps3.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/calculus_and_its_applications_9th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/81729131362.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_off000056eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56EB 5912 bytes
SHA-256: 2efb53fbfd202c3b6598e306c7a00e593cd69454c35909afddab88907baafb2d
font_01_sfnt_off00006ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE1 9780 bytes
SHA-256: 5a044c76a96ee1a867121ff6e4016afb3442dd956b07dac747739133fd84cb73