Malicious PDF — malware analysis report

Static analysis result for SHA-256 819ebef891bd77e1…

MALICIOUS

PDF

46.4 KB Created: 2020-11-05 16:11:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 3ab50c93482308644a16fac422338e76 SHA-1: 4b17282d0bb3dc8ca944351f47de352ef63dc532 SHA-256: 819ebef891bd77e10a80188747e3dab658ec88ea6eb58b636d84dbb245699061
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://trafffi.ru/aws?keyword=samneric+quotes+with+page+numbers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454302/normal_5f9fd1f9218ba.pdfIn PDF document text
    • https://mukokoloraji.weebly.com/uploads/1/3/4/1/134131612/jewajezuju_bepasexa_bedujakozamuxen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5fa119d1c6c01.pdfIn PDF document text
    • https://duvupobilalef.weebly.com/uploads/1/3/4/6/134630448/ruzegosovejobod_fazabatetelovo_sulitezotosaka_vugereruxifog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_5f9299c251a9e.pdfIn PDF document text
    • https://didowivukosu.weebly.com/uploads/1/3/4/4/134470318/9992643.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/tomiroko-satasisotone.pdfIn PDF document text
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/jexixakulunobikumav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450731/normal_5fa2084b82eff.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/somamere/java_xml_parser_apache.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/2818462595.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e962f1b9-2128-4aff-a325-57292051480e/orange_jasmine_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/wuxoxulipafemidibuzofen.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/safonogotonasuximitudozev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c44ac6-322f-41b1-a20b-4e8eddd234f1/66930281730.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_off00007629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7629 5776 bytes
SHA-256: 8d39caeef8e57e2c25c9ae7853f19e87787810b5809e84592ad12bb8994ed7ee
font_01_sfnt_off000089b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B8 10288 bytes
SHA-256: 31b4df93301a32300eaadc68f21c4518fb9c49be8e36487433951374ead71410