Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fbd78f13db5cc72…

MALICIOUS

PDF

34.6 KB Created: 2020-11-09 07:25:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: a418b3e59cd318c9a58296b0fc598bb6 SHA-1: e3d949a5ab9de2213b0587b26ccae7dab377130e SHA-256: 3fbd78f13db5cc7241493b5fd2f376627c7b7f9b5cf974e02dc04016f7866e25
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/123?keyword=tax+computation+worksheet+for+2012 PDF link annotation
    • https://gusobenatidisa.weebly.com/uploads/1/3/4/4/134475091/192144f.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/4684087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369915/normal_5f92ac5b13ffb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422631/normal_5fa58a412fe49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5f87d7a1e1d55.pdfIn PDF document text
    • https://sawonelezaxiso.weebly.com/uploads/1/3/4/5/134588179/6981533.pdfIn PDF document text
    • https://vilujelirajoki.weebly.com/uploads/1/3/4/3/134378771/8080922838c94.pdfIn PDF document text
    • https://saxejuwujare.weebly.com/uploads/1/3/4/4/134448786/gumajipobes.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/kigavanus/aromatic_non_aromatic_antiaromatic.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/vakotirutozapu.pdfIn PDF document text
    • https://vurovuki.files.wordpress.com/2020/11/mamiya_rb67_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/maluwajetorufu.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/nolozot.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/dirty_text_messages.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/anatomy_trains_thomas_myers.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/18744329387.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_off00004941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4941 5724 bytes
SHA-256: a19f1444e1ccfc62d9ac819ae44d5b1c62ac2deb1cc65f6217390466b0e1c41e
font_01_sfnt_off00005cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAC 9496 bytes
SHA-256: 3b5e3a90ee7c5602931b02f4235d8ffcc1407b3eaf3c4028a200966d635104ce