Malicious PDF — malware analysis report

Static analysis result for SHA-256 5491b216861fa57b…

MALICIOUS

PDF

51.8 KB Created: 2020-11-06 08:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-10
MD5: 1ba9857027a3c73475e3d4cb8ee464e8 SHA-1: 0d72713be02d329195303b5a61cb12ddc35d3969 SHA-256: 5491b216861fa57b1e38e14549d770e4e59df3ac09b219e1b0ce334d3e493cff
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=basketball+study+guide+high+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402503/normal_5f9b0ca679629.pdfIn PDF document text
    • https://wojawafelufofux.weebly.com/uploads/1/3/0/8/130813934/kuvemeromot-lizojilup-jikebixize.pdfIn PDF document text
    • https://xuwojuzo.weebly.com/uploads/1/3/4/4/134471705/konopomejuwi-jowiwizoj-guwebis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f892efb878e7.pdfIn PDF document text
    • https://tadafami.weebly.com/uploads/1/3/4/3/134386911/8724178.pdfIn PDF document text
    • https://golosoruxo.weebly.com/uploads/1/3/4/3/134339442/laligafukirexa_mikidunoxoxomo_xesoreboriz_topuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00008c79.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00008c79.bin)
    • https://uploads.strikinglycdn.com/files/c33e7a69-8931-4167-a1e1-1a04af14e3da/debatarosofofonapobeja.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/antiepileptic_drugs_in_pregnancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c89b3eef-4244-4dd6-a4e3-4a0e1c095123/65900866810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cafa321-0076-4328-9f01-d271ba279293/fulton_county_calendar_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95cf744d-bfee-41af-bd08-84d3282c7431/sunnyside_high_school_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d200e88f-1b32-4b3d-aae9-a1601f55c140/82567633731.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/biotechnological_application_of_enzymes.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/stages_of_conflict.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/zanufofabad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4adfd8ed-7b39-4f40-a64a-e92c57c2b63d/keto_charge_from_shark_tank.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_off00008c79.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C79 5460 bytes
SHA-256: 7ae1d284bcf149fca98cdfa567a073d2719914a7f8e0dff3aca57f974dd8ca86
font_01_sfnt_off00009f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F19 10296 bytes
SHA-256: 82be59beb38389a93bf2df6da09c7ef8f1db15d4c1fe8a47054509390d84ca1e

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