Malicious PDF — malware analysis report

Static analysis result for SHA-256 b252beb5941bd886…

MALICIOUS

PDF

51.9 KB Created: 2020-11-05 23:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: f7cfa8ac23b8bc8318a0c01d5fba5d19 SHA-1: d8e31b37206b35534b613f315330de7186b89f3e SHA-256: b252beb5941bd8867462138845d319d3a5cb50b798babf8f9bc84b5e1fc8183d
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=verizon+fios+tv+guide+blank PDF link annotation
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/jasamatelez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408352/normal_5fa36cfb744c0.pdfIn PDF document text
    • https://geredape.weebly.com/uploads/1/3/4/3/134349068/4429274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f8e9d85c4dcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_5f923e2ccc6d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407988/normal_5f9282264ea83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_5fa04e85c95e2.pdfIn PDF document text
    • https://xabejopoturidu.weebly.com/uploads/1/3/4/3/134352457/matefo_dopufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5f8ee4ae43039.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2179/3945/files/mulan_2020_trailer_2_msn.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/6867/7016/files/literal_equations_worksheet_hard.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_off0000891c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x891C 5352 bytes
SHA-256: dcc53ed0174df4473e0073379907a8d156f294de06dd12dfe74b27cf046d0ed1
font_01_sfnt_off00009b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B76 11688 bytes
SHA-256: 2408bdfb419d5a52b03d2aad7cc895b55c7d1a5cbadc5f3cc77f81b4bfdc500e