Malicious PDF — malware analysis report

Static analysis result for SHA-256 138c91d087bff187…

MALICIOUS

PDF

44.1 KB Created: 2020-10-01 06:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 80ce42b77777804af2cf1b46ebd44e91 SHA-1: fe4683a8f23aa3653b5217190df950f34806d6e0 SHA-256: 138c91d087bff187cdec68a9569e83e27cee4c9c7384125df1a3c16a9bc322c0
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=benjamin+franklin+an+american+life+by+walter+isaacson+pdf In PDF document text
    • http://noruxu.apiswc.org/uploads/1/3/1/4/131437601/3950214.pdfIn PDF document text
    • http://rutomon.bobwaltervoiceworks.com/uploads/1/3/2/7/132710603/gatoxoxana.pdfIn PDF document text
    • http://files.ecsmge-2019.com/uploads/1/3/1/8/131856077/salepazurunar_notidiwoxakufaj_bisamizefonenum.pdfIn PDF document text
    • http://xaxiga.shrewddigitalmarketing.com/uploads/1/3/2/7/132740748/18a3369d913d.pdfIn PDF document text
    • http://files.breadbyerika.com/uploads/1/3/0/7/130775518/1739139.pdfIn PDF document text
    • https://site-1036665.mozfiles.com/files/1036665/50123807360.pdfIn PDF document text
    • https://site-1038451.mozfiles.com/files/1038451/32715681997.pdfIn PDF document text
    • https://site-1037075.mozfiles.com/files/1037075/luxegapivumalagifeferuv.pdfIn PDF document text
    • https://site-1036951.mozfiles.com/files/1036951/23942966338.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/1/0429/5199/9637/files/general_knowledge_trivia_quiz_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0904/7708/files/ib_biology_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1686/5952/files/gisujafepuwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/28991575990.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2345/6661/files/94117237748.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9427/6264/files/meilleur_livre_pour_apprendre_l_espagnol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/85155057715.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_off00006cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBC 5824 bytes
SHA-256: 22bdee4eab63c7bcc45f18118bc4ec047466b073a6d0e191c9641c5132be9977
font_01_sfnt_off00008095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8095 10124 bytes
SHA-256: 25eb52a9b6bc2835ee74ad47b413fe85c18b9fd20c5eeabb6df6fe300db1a6f2

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