Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ff68aeec180b08…

MALICIOUS

PDF

43.9 KB Created: 2020-11-07 01:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-02
MD5: 531e7d4403813d2c0050f28902a687b8 SHA-1: 4b1d0efd3e1bac08e5a940f355535c52fdff2e99 SHA-256: 21ff68aeec180b08d304489bf0e889267491e5e6f8b26af29a685b6cf18b64a6
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=yu+liu+md+compass PDF link annotation
    • https://negiwonilelif.weebly.com/uploads/1/3/4/5/134583179/xutowoku-wifojiv.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000676d.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000676d.bin)
    • https://s3.amazonaws.com/luropi/tividedefigavidibes.pdfIn PDF document text
    • https://sirilab.files.wordpress.com/2020/11/tabifenid.pdfIn PDF document text
    • https://levozenitaxi.files.wordpress.com/2020/11/cinema_paradiso_trumpet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/memphis_football_depth_chart_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/nazemisita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76cbb963-ea52-484a-be02-99aa5bc303f4/91597867648.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a20c2a1-f609-4d7f-a667-d675d9ea7b55/tikuwirotevufarukamudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a069d555-158f-4104-bbb5-f753272ab605/vrvigraafika_cheyenne_wy.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/tone_color_is_the_same_thing_as_timbre.pdfIn PDF document text
    • https://niragadofob.files.wordpress.com/2020/11/91976350662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0202ea3-3f8a-4f3d-9113-09aefe247d46/16046644489.pdfIn PDF document text
    • https://vabavoresadi.files.wordpress.com/2020/11/debewasomogoro.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 extracted file (font_00_sfnt_off0000676d.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000676d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x676D 5084 bytes
SHA-256: 00a9de721f8eb13aba5da375ec3b6539deffd25f94c679be5987784d0df51499
font_01_sfnt_off000078a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78A6 14092 bytes
SHA-256: d075ae47244cd6d2633cb2a89ba50d349aeeb4587245c0af3af5b66a1a83a91d