Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8cf20cc20b7af2…

MALICIOUS

PDF

49.1 KB Created: 2020-11-07 23:49:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: d0e18128235b1d760693dc571636d812 SHA-1: 5bd35c54a872af137d13b020bf2834f872e4bb71 SHA-256: 0d8cf20cc20b7af2715d769b88e7e6a67ab1405b7f4f34b09f5e79e1b21f5eef
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=2020-21+nhl+season+wiki PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5f9d40355ec3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5f959d5c69f49.pdfIn PDF document text
    • https://malinozibide.weebly.com/uploads/1/3/4/3/134380659/4743294.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383146/normal_5f8d0ecc72fd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473890/normal_5fa48ee233fc1.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/vexeliku/vivirewarogoxodojerafiwun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3112aa9-7ca3-44cb-a584-7fdbb6d2b75f/19735731676.pdfIn PDF document text
    • https://wotenopofe.files.wordpress.com/2020/11/budixaw.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/27590091229.pdfIn PDF document text
    • https://pevimuve.files.wordpress.com/2020/11/the_road_to_learn_react_review.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/zimenavo.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/ribebofu.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/eagles_game_channel.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_off0000830c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x830C 5096 bytes
SHA-256: 4b1e39e0f78722a5c986a066f5d21df0208702a3bec0faf29a0395e7eda2cd4e
font_01_sfnt_off0000947c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x947C 10348 bytes
SHA-256: d683662e150d79df62e1b54087f15b373eeb919922b93d791732220468f1021e