Malicious PDF — malware analysis report

Static analysis result for SHA-256 db7c3af8ef3d6403…

MALICIOUS

PDF

41.3 KB Created: 2020-10-30 14:38:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: f5ed9396fddf48ec3c10b4104a735690 SHA-1: 46cc8628c401819c12f62b489cd7c0d9f2384e0b SHA-256: db7c3af8ef3d64030e2149ebb93761de80a7465de51f102a65a0e08f1910a8ef
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?keyword=ap+physics+2+study+guide+pdf In PDF document text
    • https://zinawadasug.weebly.com/uploads/1/3/4/3/134312837/xomuwus_lituda_wunotupegemepe.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/sevanubiverapekaxeto.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/d5428ef2.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/badifikig-limuwukivonukon-labajobix.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off000060e8.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off000060e8.bin)
    • https://s3.amazonaws.com/lebaxa/23315085051.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/pupopenosife.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/mewotunuxeroxa.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/48284972118.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2499/8819/files/27074174277.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/29760798542.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 extracted file (font_00_sfnt_off000060e8.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000060e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60E8 5300 bytes
SHA-256: 5548b0546640bd1ae4dc8546f0d7f74afa1610a43fcb6997672775dd9e16f7e7
font_01_sfnt_off0000730d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x730D 10932 bytes
SHA-256: 4a9a663432e8ef85e28bdf92f64e4fccef78d1959fe9bbafd3b18cec4ba6a2c8