Malicious PDF — malware analysis report

Static analysis result for SHA-256 136eb78dafb8bdb9…

MALICIOUS

PDF

41.1 KB Created: 2020-10-01 05:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 61b2a89e48eaa754ed57d5105de22a90 SHA-1: 373f5647a43369097da4985d729e4aece3f12bfd SHA-256: 136eb78dafb8bdb92cbed78d9792bab8d1dd0b5d77654bd5c6d6708ae3c1c738
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=calorie+counter+uk+pdf In PDF document text
    • http://files.tomsaundersart.com/uploads/1/3/1/4/131454816/2513375.pdfIn PDF document text
    • http://pupetose.hemispheretohemisphere.com/uploads/1/3/2/7/132710634/fovanarusebi_nusigejuxagikam.pdfIn PDF document text
    • http://files.communitychurchofkeystoneheights.org/uploads/1/3/0/9/130969681/fed8cd07f7.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/1/0463/0288/8093/files/monthly_retirement_planning_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/california_eviction_defense_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/2753/7560/files/hummer_h3_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/free_business_plan_template_for_investors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4029/6090/files/3781536629.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3382/9271/files/wordpress_admin_menu_editor_pro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/8779/1015/files/4334263690.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/denizozufofinire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6905/3854/files/sog_twitch_ii_brass.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0682/7428/files/tipos_de_contracciones_musculares_pd.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/15590418677.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_off0000644a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x644A 4940 bytes
SHA-256: e0b1ca774e502b30ebe625e944dcacd67ff5ff2cf4f382e896a32ece9ee71eec
font_01_sfnt_off0000752d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x752D 10060 bytes
SHA-256: 85bb0c4314fe9bcc2504ffbdf2f018ba8f7ab9767749e213169f886ae4923295

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