Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f645e01679daac…

MALICIOUS

PDF

40.7 KB Created: 2020-11-05 21:33:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 46dd8de3801d6e70aeb979ca7cb4846e SHA-1: 29dee2a59937f1572910b694879b35931d9ad37e SHA-256: 43f645e01679daac2a56f26c0e7bf74ba8b083506b23e0deb23728809d7bb129
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://trafffi.ru/strik?keyword=sedalia+elementary+school+columbus PDF link annotation
    • https://nulejekenafu.weebly.com/uploads/1/3/4/3/134367691/9180527.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/pofilufe.pdfIn PDF document text
    • https://juzudibat.weebly.com/uploads/1/3/4/3/134328144/5753975.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/tixobenudofezibet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366327/normal_5f87620e64464.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/joterige/american_english_file_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/50882021403.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/bubble_witch_saga_3_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/comunidad_latina_fcu.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/86250325313.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/nova_movies_net.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/dbz_supersonic_warriors_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/69742657636.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/namekian_dragon_ball.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_off00005fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAD 5524 bytes
SHA-256: ce22e6d633d3ce47e30917c828a0f83e85ecc8e2b6916ba5d0f1fa65d7375d52
font_01_sfnt_off0000724e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x724E 10540 bytes
SHA-256: 33204b7daacc41b93040e0e674dc210adac9273fd8d7a3daffaaf4b28d25f606