Malicious PDF — malware analysis report

Static analysis result for SHA-256 72303cf724c1c869…

MALICIOUS

PDF

45.4 KB Created: 2020-10-03 04:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 5b485426c5db5d514ba09ce8002557a5 SHA-1: ee5c5962421f6392aa5cf609ffa8644883107bfb SHA-256: 72303cf724c1c8696507af0942162dea86b454d6f89db9c6ac33251d2c34b09a
234 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=que+es+una+entrevista%253F In PDF document text
    • http://wavusivug.mermazingbeautypearlswithcasey.shop/uploads/1/3/1/6/131606636/rikumebiwamusi.pdfIn PDF document text
    • http://files.romanhoering.com/uploads/1/3/1/3/131381036/7542402.pdfIn PDF document text
    • http://files.fatbluesky.net/uploads/1/3/0/7/130775260/bufewafag-lojetupigit-jenubovimimare-relezawi.pdfIn PDF document text
    • http://files.procombatsportsgear.com/uploads/1/3/1/4/131453850/gejawep_fatudalesizowi_tefuriderinona_jukikatexepusok.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/1/0430/9463/8749/files/zaxubovorewelawofenowa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0385/3476/files/christmas_lane_kenosha_map.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8953/0532/files/fahrenheit_wireless_headphones_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5916/6888/files/29747906232.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/impulse_and_momentum_worksheets_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2897/4237/files/the_lincoln_lawyer_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4514/9079/files/pigipolakixijiveronilo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6441/6661/files/bed_bath_and_beyond_instant_pot_3_quart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1028/4456/files/to_kill_a_mockingbird_plot_diagram.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/44778310572.pdfIn PDF document text
    • http://luvibigaj.rovers-victoria.square.site/uploads/1/3/2/7/132710675/nupudalalisad-lajazatifa-nerazoko.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_off000074cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74CC 4908 bytes
SHA-256: e5aef23b261eba6535300881e542992bf0af3a7be04fb2d492702fb8901bde27
font_01_sfnt_off00008590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8590 10364 bytes
SHA-256: 6dc8bd723ceddaaaadb5354dbed82ffa37748096d9036a9e8d8adbde891aa442