Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78643c10cfb11f2…

MALICIOUS

PDF

68.3 KB Created: 2021-02-05 22:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: 7a37ef383a382929c1cf2735ed571831 SHA-1: 91456f62785588547ef1a2d9429574f0f61f5c62 SHA-256: e78643c10cfb11f2ce04adf81ef870730bc8121838aff6e1021bdafd0c6f3feb
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=jingle+bells+violin+solo+sheet+music PDF link annotation
    • https://cdn.sqhk.co/xipepovivik/jj1ibVH/31336997296.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464319/normal_5fded6ba6ca1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446914/normal_5fd9b9e205207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_6019105f5b622.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/6Bjjiij/xinopal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394071/normal_5ffc2b59e7977.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380086/normal_5fe4274376af0.pdfIn PDF document text
    • https://wotudopis.weebly.com/uploads/1/3/4/6/134679731/bumovov-jixatuvelisofe.pdfIn PDF document text
    • https://ruxakidefo.weebly.com/uploads/1/3/4/1/134131713/6318265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420454/normal_5fdaaf442a706.pdfIn PDF document text
    • https://cdn.sqhk.co/kixobaza/hgiwhvV/rimavoduwijifiza.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/pukiza/new_gems_english_reader_class_5_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/65191466816.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/fagosoz.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/3032969263.pdfIn PDF document text
    • https://musescore.com/static/musescore/scoredata,jsoIn 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_off0000cbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB3 5096 bytes
SHA-256: 3f43e0b7978e9b93aaece5f5e36a67864d0569eb093134426ebca840c33581a1
font_01_sfnt_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 11692 bytes
SHA-256: 81c876b258cd169f00f46ee69e6c6b828fc7aafe0cd6c47ab5e8cc4535171809