Malicious PDF — malware analysis report

Static analysis result for SHA-256 33649cbd78d048b0…

MALICIOUS

PDF

35.1 KB Created: 2020-11-07 23:10:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-11
MD5: 033d7cc8cb99d42e47b11f3efbd0d304 SHA-1: b475282788e9e14dae1467d4d1527b7859bd5c38 SHA-256: 33649cbd78d048b05ab0e21bcfe073d5b5b718f51ac0d7fbc0be0f70277e53c1
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://trafficel.ru/123?keyword=gacha+characters+cute PDF link annotation
    • https://gujibimusexuwub.weebly.com/uploads/1/3/4/0/134042380/701794.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/rinedetorol.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/8690a24a63d.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/suvex-xebubonozov-gavubukegago.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5f89a3186b4da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pukasojalu/tanglwood_lakes_hoa_fees.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/68051716621.pdfIn PDF document text
    • https://mikosefuz492460143.files.wordpress.com/2020/11/70777988362.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/dragonborn_age_range_5e.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/incineracion_de_residuos_organicos.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/ribolumisovevakopesokoko.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/etabs_api_documentation.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_off00004f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F36 4884 bytes
SHA-256: b8a38fe957599c521435b7290e29701acdd51a3b2f6e2647d79d48e921586e5e
font_01_sfnt_off00005fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCB 9484 bytes
SHA-256: 33406db026ca4639b1737df94940dd8e002d2a0cd9eb06ab8d8efeb7bf96c2dc