Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4c2d19d87146df…

MALICIOUS

PDF

45.1 KB Created: 2020-11-05 19:35:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 532480421fdd27fdab23d60566bd7c41 SHA-1: 0a52b4747038994d4e6877ceef7dd2ceceaafa0b SHA-256: 7c4c2d19d87146dff1a91a51f8f83d7a526cb18633c36466e438719cc065599c
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=star+wars+the+last+jedi+cinema PDF link annotation
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/pejajofedaxevaw_kozadesupuke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_5f96380c87218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423471/normal_5fa05798a6905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_5f9cf668c7fd7.pdfIn PDF document text
    • https://monubigikupo.weebly.com/uploads/1/3/4/4/134493781/8539390.pdfIn PDF document text
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/6681df9f0.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/rimejiguvif/45569507298.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/sakamichi_no_apollon_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d847e8de-fc88-4c54-844c-2edd01b539be/tolilon.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/38268329909.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/auditoria_medica_definicion.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_off0000734f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x734F 5452 bytes
SHA-256: 989aaaa9276e44ca873d165b830b2f3e9cf0c909809ec64937f3063bd50979d8
font_01_sfnt_off000085bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85BC 9984 bytes
SHA-256: 465105dd7723946953ad4d3d8189a001f2f705d826f343e043e00c223f3f6e4f