Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c404c67a390d770…

MALICIOUS

PDF

60.1 KB Created: 2020-09-30 17:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d737d591a5db86b8153fa77ba21ed10d SHA-1: 84bf23593f853f9c57959a3e22a9765dee9d45ce SHA-256: 5c404c67a390d770e155cdcfbdbd27926820117f2ece00024a9b262245cdde64
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://cctraff.ru/strik?keyword=effect+of+drug+abuse+on+youth+pdf In PDF document text
    • http://ravudi.wickedfreshsalad.com/uploads/1/3/0/8/130874493/venitokomafozog.pdfIn PDF document text
    • http://files.willamettecounselingservices.com/uploads/1/3/1/4/131454190/putaxotelaragoz.pdfIn PDF document text
    • http://files.dldtassociates.com/uploads/1/3/0/9/130969184/vufunat.pdfIn PDF document text
    • http://files.handykiwis.com/uploads/1/3/2/8/132814680/e0d228e75a.pdfIn PDF document text
    • http://bufebe.visiontreecenter.org/uploads/1/3/0/7/130775379/4582201.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/1/0434/5040/0928/files/finemilu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0221/4046/files/12064842629.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8553/6161/files/separation_process_principles.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5011/4978/files/50898856354.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/a_sabedoria_do_eneagrama_livro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/mawefijasamevovaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8035/8811/files/45649080321.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4061/8134/files/3762603888.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/kimefojuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9888/1704/files/bangladesh_army_civil_job_application_form_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4085/7494/files/56151524084.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_off0000ac69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC69 5584 bytes
SHA-256: 7fab3e53745f2ee812cfd10f27d36d1ced1b392a812ce4f6d67b43b9e423c6b1
font_01_sfnt_off0000bf69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF69 10492 bytes
SHA-256: c0b06188dd6d1f6fa0618e64158da031cdab7fe8bf84d864ffee7cebfcaaa2a2

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