Malicious PDF — malware analysis report

Static analysis result for SHA-256 87048d623b780a1d…

MALICIOUS

PDF

36.8 KB Created: 2020-10-01 04:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8f9ac64fb53b31f647668d81490ceb8a SHA-1: 63c955b83f0dfa8704712d4c8abe8b60f50fa508 SHA-256: 87048d623b780a1d9dd0a6efe6f9820fb9de503780a8319c0a0470ac9d9551c0
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=difference+between+carnot+and+rankine+cycle+pdf In PDF document text
    • http://jetunax.calaverasarts.org/uploads/1/3/2/7/132741100/3500105.pdfIn PDF document text
    • http://files.woodlandscubscouts.com/uploads/1/3/0/9/130969494/1251185.pdfIn PDF document text
    • https://site-1038468.mozfiles.com/files/1038468/xaxonosilozisuluki.pdfIn PDF document text
    • https://site-1036815.mozfiles.com/files/1036815/27105113423.pdfIn PDF document text
    • https://site-1037178.mozfiles.com/files/1037178/mumupu.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/1/0431/0351/8887/files/42543731636.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2182/7222/files/flo_rida_my_house_mp3_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0459/1255/files/vetibasifumoxanawod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/wave_interactions_practice_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57dfef0f-32c3-47b8-ac07-8194768ff35b/61828818166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5dade69-22cd-4e43-bd8a-b7662267be80/pejotipotemeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2270a8d-ff5f-44b8-b80e-5f6ddb6923a2/nawazusujijokiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc7eb0b-fdf0-42b8-bcfb-b6b3bf807f8f/91619084771.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_off00005226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5226 5368 bytes
SHA-256: 747f42b1b444a17513a5935cf263b3f703d744e430d131d774793e6c21bbc5a5
font_01_sfnt_off00006496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6496 9944 bytes
SHA-256: 6503231ab79c00dfb9582804d87abb561a844876e46d9ce2a90723d7f40910f1

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