Malicious PDF — malware analysis report

Static analysis result for SHA-256 35fc51b73cedfa0a…

MALICIOUS

PDF

35.9 KB Created: 2020-10-06 23:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: cd8600d9bcfd7f959e921535132711a8 SHA-1: 6861469a82e91d23e0ad4a27e3501e9834042b5b SHA-256: 35fc51b73cedfa0a2406f075cb1751761ddec7e56344c8491fa292868dfcd070
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/strik?keyword=excel+sheet+for+crane+girder+design In PDF document text
    • http://tipas.innspyre.com/uploads/1/3/0/7/130776074/rusobisejomud.pdfIn PDF document text
    • http://files.omnipilates.com/uploads/1/3/2/6/132682125/5574892.pdfIn PDF document text
    • http://files.guillome.nl/uploads/1/3/2/3/132302916/6e8ee987e7db9b.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/f7928f6c-f6ac-4366-bb82-01cc85aa8763/malodibavorawigis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d942d70-34b1-4f61-bf54-bbaeeb0717e8/32278515576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13fa1d12-03d5-4e62-b6e8-6ea5115c5e6d/41085704169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5017ca08-d469-4474-bd68-e36dc34286e4/88979172202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629c77d1-2946-4e68-8e9b-4c33ee7303c3/41083838931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/172685fe-1859-4498-9aa3-c0084aec755b/30015077532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9942b456-df6c-4ae5-bf76-ff5b98e6077d/70128231895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6521d034-a31d-4fce-9803-d06855efb93b/67834213257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d3c7862-dd5a-4037-8662-f6cecc15f13e/28530473835.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/0054/9535/files/81355058563.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5760/5529/files/46213184075.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/6777/9488/files/57290859795.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_off00004da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA9 5308 bytes
SHA-256: feacfc6cf56f7c28d19f15b32eb8c982a425d7b222d95e57f255066729784fb5
font_01_sfnt_off00005fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB9 10152 bytes
SHA-256: 5daec94fcd470b0eed96d15da7c63d1b68cbff25c58634cb3560db26eb08c124

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