Malicious PDF — malware analysis report

Static analysis result for SHA-256 582836ff7d16f8b0…

MALICIOUS

PDF

45.9 KB Created: 2020-10-08 23:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 2c0f323263da368f5b50fe6edd3868bc SHA-1: eceb298a6534547aa7ebafa2158737f84a53c4b9 SHA-256: 582836ff7d16f8b0ed52662cc23144822e696ba5d29849ea2a0b8f332816784b
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://ggtraff.ru/strik?keyword=generos+de+la+literatura+contemporanea+pdf In PDF document text
    • http://files.poshoccasion.com/uploads/1/3/0/9/130968915/187f1ad81a41.pdfIn PDF document text
    • http://nenum.askdrben.org/uploads/1/3/2/8/132814097/tekegulemi.pdfIn PDF document text
    • https://site-1036791.mozfiles.com/files/1036791/89971663233.pdfIn PDF document text
    • https://site-1037222.mozfiles.com/files/1037222/29364190839.pdfIn PDF document text
    • https://site-1040325.mozfiles.com/files/1040325/sewijukovagivari.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7448/8982/files/my_community_worksheets_for_preschoolers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4689/4758/files/nesepazudowasajaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3035/9457/files/reproduction_vocabulary_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3963/2803/files/lds_12_step_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/7688/8992/files/dozinas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/7355/4582/files/myra_vishwakarma_instagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6952/2599/files/henry_clays_american_system_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/8107/8686/files/limits_to_infinity_lyrics.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4683/6123/files/razotebulasetewi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/60234740758.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_off000071fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71FB 5332 bytes
SHA-256: d02e7aaa923afbf5731e7ba8de0139b19221ba185d895cd9386034396786156c
font_01_sfnt_off00008409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8409 11420 bytes
SHA-256: a2fa5f6f95cd772edb10e255342fb78ed3d4868c27e4d6bfcdb12351df4e9659

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