Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cff2b2a648ebe2…

MALICIOUS

PDF

42.6 KB Created: 2020-11-07 02:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 8045595f449a59cd869ed70921b49b06 SHA-1: 2443d2fa8f9b80f684ae4aa4e80373980ab2db90 SHA-256: 41cff2b2a648ebe22ccdb619ba294e32542f15ddb8b4edaa86d660e37507d74a
144 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=the+college+panda+sat+math+pdf PDF link annotation
    • https://misutinulil.weebly.com/uploads/1/3/1/4/131407711/tupunavowaxosixu.pdfIn PDF document text
    • https://davovexo.weebly.com/uploads/1/3/4/3/134355956/zibukup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xipavir/t-mobile_kyocera_hydro_wave_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/41109891990.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/wenugotoraga.pdfIn PDF document text
    • https://teviwuder.files.wordpress.com/2020/11/69401642201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9535ac-56dc-4b71-ae58-e0474dbe7b47/lodimebamawelalime.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/asciidoctor-_ubuntu_install.pdfIn PDF document text
    • https://buxefonatis.files.wordpress.com/2020/11/modern_condensed_matter_physics_girvin_download.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/nufobofajiwes.pdfIn PDF document text
    • https://vorigiputop.files.wordpress.com/2020/11/lomeraritogaxami.pdfIn PDF document text
    • https://zomizekakigo.files.wordpress.com/2020/11/75558862147.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/paris_2020_population.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5955 5160 bytes
SHA-256: 69e3c15824d81af7fc0352ccc32abcfda81a9d1db84aeb24800c5a181b4377cf
font_01_sfnt_off00006aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABA 10876 bytes
SHA-256: 262c6c69f3ae146865a4549eee18656a88245aad9ecf56e1f1ee3bd09580d855
font_02_sfnt_off00008fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3