Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51e343ca99a3c7f…

MALICIOUS

PDF

42.4 KB Created: 2020-11-07 00:07:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 2871a6b5fdddf49e62f77c08c6853b83 SHA-1: 09fd609520e943e85530157f1c51920a612c393d SHA-256: e51e343ca99a3c7f71313f3646bd10569ac6af9c22ee239cdc5fd1733e2347ba
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://trafficel.ru/aws?keyword=national+family+life+insurance+complaints PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376598/normal_5fa2a9d3af358.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/tofinesowekakinob.pdfIn PDF document text
    • https://fofaxofik.weebly.com/uploads/1/3/4/5/134521529/9526201.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/voreneb-pejulusi.pdfIn PDF document text
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/99c8160b79397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5f8d39aa67ee5.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/lakadutof/chatham_school_of_science_and_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/66013937312.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/diccionario_etimologico.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/i_wish_you_the_best_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/54974274528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a03b361-0bfe-41fc-97af-ee2e510087a3/14610406773.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/excel_practice_exercises_vlookup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebaf3c3a-42bc-43d2-bb39-9ba380c373c9/5676879163.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_off00006676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6676 5232 bytes
SHA-256: efa24de44b9594ff46d5718197400b999025db63571f678745d30dc37376ac97
font_01_sfnt_off00007844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7844 10780 bytes
SHA-256: 939d7455712f17444b0c71b1c0abafc550db263f5a8f6fc95a1f9d652d4d7a7b