Malicious PDF — malware analysis report

Static analysis result for SHA-256 28cb16647869b6e9…

MALICIOUS

PDF

34.3 KB Created: 2020-11-06 10:18:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: 049f79744f13e4cab87132f4e6289d15 SHA-1: 7883999abacb57af7fb833b91db244fc13739d04 SHA-256: 28cb16647869b6e9fdf40b5c1da3b4a66f714be801ea3ea50b89655a01aa6ccc
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/strik?keyword=caution+sign+png PDF link annotation
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/vizerime_kinidul_sikiruga.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/wixinidigaruzaz.pdfIn PDF document text
    • https://rugazodexozapef.weebly.com/uploads/1/3/4/4/134480570/bikilesapinevos.pdfIn PDF document text
    • https://sunakixekorej.weebly.com/uploads/1/3/4/3/134376052/mosusurez.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/notugawi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/08cf4d38-d078-4b61-8f24-f73f1ab7ab67/fotesejuwuzofadizudubirip.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/63959584394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cff9dc1-9e4d-4d39-a868-0f5713fff2e2/33313081022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed495aa-e607-468d-830b-ba105707d7d1/ti-_89_emulator_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb4034b6-cd84-470d-aaf0-9b76a84b27c7/77411692702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2483b652-939c-4f2b-88b6-70969fa7f9a8/xaxadojufexeminuwexuwato.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_off00004be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BE3 4764 bytes
SHA-256: defd96ab96c3aae6cd9e84660b8af0087d5b9c7dcc3c80833e8701766c141393
font_01_sfnt_off00005c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C2C 10168 bytes
SHA-256: 3782306671f977c2ec01e7b04fe5324333636bb6c4bc56e6c9e41b032e24ee04