Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7121500301906c6…

MALICIOUS

PDF

47.7 KB Created: 2020-11-02 00:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 99a6e2c03c4976fe9a2e3a9b0e4ee84d SHA-1: fe0484516777365b1d3c3be0e9a2feda8b33cd0c SHA-256: b7121500301906c613dab92e0d8f4b71b4007bb6fd6a303942d879e2b2eeaafa
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/3874214.pdf.
  • 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://ttraff.me/123?keyword=online+american+history+textbook+8th+grade In PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/3874214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_5f9ba0dd19243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f91f297763f4.pdfIn PDF document text
    • https://fijefozumomaba.weebly.com/uploads/1/3/4/4/134491855/c2ec326f615e9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f873a5f7a929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387813/normal_5f9d6723daa8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_5f9af5dfa41e3.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/3026362.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://cdn.shopify.com/s/files/1/0492/4158/7878/files/sorebikafojofirebi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/6079/5798/files/wekoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/lixololugemoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8617/5139/files/requisitos_para_pasaporte_mexicano_en_houston.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02d63df3-d30f-4902-b683-c8a56a63d5a5/describe_a_tree_branch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3619/2167/files/swami_vivekananda_books_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5394/6782/files/38746668344.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0E 2900 bytes
SHA-256: b3dfb2f2c41da7350fc3755141d2fd0ea5796bb125df25fec831093623ff73df
font_01_sfnt_off00006951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6951 5736 bytes
SHA-256: dba5bb634ca3e2c4a7077884c5616f5cd2c681782ce96290777d04126e5627e7
font_02_sfnt_off00007ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA8 11676 bytes
SHA-256: 27f273c93984893fce73a5fd5260cc5b102ffee78de76cbd246d89b0c307232b
font_03_sfnt_off0000a334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA334 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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