Malicious PDF — malware analysis report

Static analysis result for SHA-256 f235a3cf78bb835d…

MALICIOUS

PDF

38.8 KB Created: 2020-11-04 01:04:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 2d4bf0fc45b11bac85978ac8fae11755 SHA-1: d195292e204bcd7a81bc48df2a168aaa9be62d8e SHA-256: f235a3cf78bb835d4f96fd79d6c868836d7c21e39ff1455822c353d810625412
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://gettraff.ru/123?keyword=wimbledon+2019+tv+schedule In PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5f9cd7420eae3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5f8faf0e82de4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_5fa0105ba3412.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/803ee4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f87497ed6b10.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/lanopebol.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/zetare/77145977869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b4e0b2-874b-4dbc-871c-5c5a7bb4b45c/22045859946.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/sedizajirilegexubejexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ed347f-0a02-4df2-a176-666ed2992c56/fnh_slp_mk1_tactical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1cb4f59-f8ae-4481-9b96-aabf80da2551/lomolozepenofagizerix.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/occupational_therapy_assessment_tools_for_autism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024122d5-78b6-44f8-b145-1d855546b170/jivovilaniwowan.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/55016342163.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/vujisizagutoruvasudixu.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_off000057ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57EE 5568 bytes
SHA-256: e3c9c52c914c3aec88d644bc2589f8c88e7b4bbc915b3903e2ae14398b9c03e9
font_01_sfnt_off00006acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACB 10388 bytes
SHA-256: 7d3c718898589fd6a846074be399c37de24d0167c5fd1004046cad6c395ef72f

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