Malicious PDF — malware analysis report

Static analysis result for SHA-256 748ba070e58be3db…

MALICIOUS

PDF

47.7 KB Created: 2020-11-06 23:27:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 5a2533200abcde7f798d22131494cee0 SHA-1: 2c8ff8ba6d008c7df000392796c613373339b1ce SHA-256: 748ba070e58be3dbe80dc00ab1261cb300c5435158ea67e4aefb3e37592d5d48
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=google+docs+icon PDF link annotation
    • https://sujuwezel.weebly.com/uploads/1/3/4/4/134486010/6eca7bab4f2f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f883b8f207d4.pdfIn PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/7135c8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379471/normal_5f8e4ea7ae555.pdfIn PDF document text
    • https://batatifenosi.weebly.com/uploads/1/3/4/5/134513642/ae5c759a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f8708ebf03f1.pdfIn PDF document text
    • https://xitupiwe.weebly.com/uploads/1/3/4/4/134489196/eed58c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373301/normal_5f972505c45b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b92186-2f7f-4998-a118-30df58932366/perfectly_competitive_markets_are_characterized_by.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a73976fc-b4bf-4212-b98b-aabeaa12b3d1/pedaborajezedezeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46eca68-7775-4518-a97a-0b3745c3b98a/detuxex.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57A9 4832 bytes
SHA-256: 0a949892e467c10d4be46f4db4c03a262718b5fdc2084f65a9ca01f5c97c64dd
font_01_sfnt_off0000682b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x682B 2864 bytes
SHA-256: 7e22dbe7c475d6840567fd2e7e0fce0082ca2a9734586ae32ec17e3b60a2e00d
font_02_sfnt_off00007448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7448 10868 bytes
SHA-256: 421b73fa6550249a0f9eda09ef1d34858cd0ad62f0d73099c492a7d639621ac3
font_03_sfnt_off00009996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9996 17388 bytes
SHA-256: d0da7dd988b5758f7a763b81582feb0894eff40e175b24bf623190431fcff8ff

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