Malicious PDF — malware analysis report

Static analysis result for SHA-256 8554dde77ea54682…

MALICIOUS

PDF

44.2 KB Created: 2020-11-09 10:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: cfd34f22d7bcb54f087a2dadde8443b8 SHA-1: 23e449f2d4409cb4954801d8a9c7a8a628abc1f3 SHA-256: 8554dde77ea54682ecfbd678ae9fd962b133bd831bdc0d5c16e724fbfd7ce96a
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://traffset.ru/123?keyword=digication+eportfolio+stony+brook PDF link annotation
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/bc89094e.pdfIn PDF document text
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/ef543e431.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d4245b1-0ed2-4bee-82d3-fdeabe6e1d0b/64669913729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb935379-89cd-43d7-bd4c-85ae597bc84a/2008_toyota_rav4_repair_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59988c1b-fdcd-406c-9b7e-7d86699cc849/el_papiro_de_ahmes.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/barron_s_sat_2_biology_4th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/67448693482.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb45d06-76c9-4383-b79c-52b2bc61e445/introduction_to_neurogenic_communication_disorders.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/486e4439-8f1e-4ec8-819c-dcf08a698e8a/code.org_course_4_lesson_22_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/12187478583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a7652c6-476f-48d6-adf0-c4b83b9af4ea/fine_arts_center_brigham_city_utah.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/roper_rebel_flag_boots_for_men.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/vulutij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c1794cf-043c-4f10-81fd-bac06a79b4f8/juselasoda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d55f804-c750-46a0-9965-cd23281d27f7/titojepikofototuf.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_off00006ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE4 5488 bytes
SHA-256: f600c1f12a3ff2d37d4a46c56235aea95f4dff89a6c23dea363fabd16764019a
font_01_sfnt_off00007db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB4 11348 bytes
SHA-256: 269890251e4989d3c652640f07bbdbc20f3e48c6f16dec7d4ef68eb9a34b6245

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