Malicious PDF — malware analysis report

Static analysis result for SHA-256 155927fd83ee6024…

MALICIOUS

PDF

66.8 KB Created: 2021-03-23 05:24:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 873b1cf6e78d9823bc3510823b2ee3e4 SHA-1: 58a71b5f87b094e72ed637c291ab0efe55cd2c1c SHA-256: 155927fd83ee60249d610da8726da23cd31622183870044f67c6c6a5d91a13aa
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wix?keyword=heathkit+hw+8+manual PDF link annotation
    • http://vinnipoh.space/how_to_buy_a_vacation_home_in_canadac4suj.pdfIn PDF document text
    • http://ejinaya.com/the_beautiful_and_the_damned_quotes_with_page_numbersztvvo.pdfIn PDF document text
    • http://idealicaitalia.website/198015880617d2nj.pdfIn PDF document text
    • http://andyhongdigital.com/65062734638y7pff.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/4818137.pdfIn PDF document text
    • http://shishkin-seed.xyz/bovafelotufozat1f6dl.pdfIn PDF document text
    • http://uspeh.icu/your_right_to_be_rich_napoleon_hill6j5b6.pdfIn PDF document text
    • https://jarofipe.weebly.com/uploads/1/3/1/4/131408229/kibipedoti.pdfIn PDF document text
    • http://remontlegko.info/39504278833x24cy.pdfIn PDF document text
    • http://8gusevshop.space/dekifubidoxamimimapu7rmq.pdfIn PDF document text
    • http://shoop-fk.ru/nupazuxuxamevuzab40mx4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tarefipiv.rf.gd/87386305481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f2e774-7fea-47e3-934d-ab5d89d28b39/how_to_paint_a_tree_trunk_with_acrylics.pdfIn PDF document text
    • http://sezesub.epizy.com/bengali_film_song_free.pdfIn PDF document text
    • http://satekivu.rf.gd/16270785729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c7c560e-f79a-4c74-934d-c871195fa5a6/dungeons_and_dragons_3.5_premade_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55353ae1-43a6-433a-ad3a-91a5d638c154/identifying_similar_figures_worksheet.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_off0000c77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77A 4960 bytes
SHA-256: 6688fef37055c0e22592f0141d74a95de771cbd4095288c6244146985ee9a4c0
font_01_sfnt_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 10672 bytes
SHA-256: b9090d87d7206e5882774eaedbe38f21a0d548c42d822f82d3703abf454ea61c