Malicious PDF — malware analysis report

Static analysis result for SHA-256 257e350782fa4e58…

MALICIOUS

PDF

70.8 KB Created: 2021-02-26 09:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: d972faf7f2d57d9f23edad0608ec7910 SHA-1: af36edba3b0b385db8954b3f8afd56831d3c072c SHA-256: 257e350782fa4e58b2bbb1fb4cea92df029b30fe9bee54616ec934d134256bdc
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/award?keyword=how+to+program+vivint+element+thermostat PDF link annotation
    • https://simokenuma.weebly.com/uploads/1/3/5/3/135311421/mizegebejon-buxodud.pdfIn PDF document text
    • http://smallita.space/total_conquest_java_game_free_download4zbwr.pdfIn PDF document text
    • http://italy50wow.pro/manual_del_aprendiz_de_cocinerolbcs3.pdfIn PDF document text
    • https://datotizit.weebly.com/uploads/1/3/4/6/134696706/4785692.pdfIn PDF document text
    • http://aov.one/the_immune_system_4th_edition_petertkz6j.pdfIn PDF document text
    • https://sidanarud.weebly.com/uploads/1/3/0/9/130969336/825947.pdfIn PDF document text
    • https://fezowekufeda.weebly.com/uploads/1/3/3/9/133999429/8464495.pdfIn PDF document text
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/fonirituvazumax.pdfIn PDF document text
    • https://gejosubirimo.weebly.com/uploads/1/3/0/7/130776575/dadobune_rujot.pdfIn PDF document text
    • http://216tilford.com/13772769784h0uku.pdfIn PDF document text
    • http://oneitshop.info/gravity_falls_episode_scary_oke3ikrv.pdfIn PDF document text
    • https://gumopokexu.weebly.com/uploads/1/3/0/8/130814161/6a479b43e7d.pdfIn PDF document text
    • https://nawowelefet.weebly.com/uploads/1/3/4/4/134498780/nufekipixuvanadaba.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/nisoxow/my_rca_7_tablet_wont_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/83805608301.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/zivejugofuw.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/lcm_and_gcf_worksheets_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/bernie_sanders_medicare_for_all_bill.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/bully_free_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/louisiana_food_stamp_income_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/dazemi/84092336429.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/death_note_2017_imdb_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/dorotemerokemekizominesa.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_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 5348 bytes
SHA-256: 158e434c081c4eec768f27d0853f47039453e779b1111ef318c2b5f22ac28851
font_01_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 10276 bytes
SHA-256: 94aa317f0a193e83649b09442341078ceaca30714e9dd5c6ca13ab9922350788