Malicious PDF — malware analysis report

Static analysis result for SHA-256 9921935b45239138…

MALICIOUS

PDF

63.1 KB Created: 2020-10-01 03:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 9f9301ea36cd1c98d357967a1ed1b2bb SHA-1: 63b1f654f8c77c43452be72d61736c703c2d2273 SHA-256: 9921935b452391381f38064874f37e5ac54ddbef33d4992f3a9ec3508e90b841
124 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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.
  • 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=shielded+metal+arc+welding+nptel+pdf In PDF document text
    • http://dovojud.julioachavez.com/uploads/1/3/2/6/132695278/416e63f.pdfIn PDF document text
    • http://files.newgenevaacademy.com/uploads/1/3/1/3/131380767/mozazana.pdfIn PDF document text
    • http://mizok.joyenomoto.com/uploads/1/3/1/1/131163991/winogitirepox_tivitizuvudoju.pdfIn PDF document text
    • https://site-1037124.mozfiles.com/files/1037124/woxajevidifituguj.pdfIn PDF document text
    • https://site-1037211.mozfiles.com/files/1037211/tibopopoxegubul.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/30095560656.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/1/0433/7693/5068/files/51777302314.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0470/9659/4590/files/bubevisafeniniro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/3195/3309/files/wekidivanirexoxosodom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d88887-fe9b-4dd8-9edc-59c7cf452040/vanumofakabado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb4f4613-2009-41df-99c1-1bfb00e3e0e2/84983499407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12d84286-272f-4fbb-bb3c-f19de5610c3b/16300347307.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_off0000b9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B3 5584 bytes
SHA-256: 658ea279c52c8aee274ea6197ff0fa43e33e765bab8dd75e6241d14aac2336c8
font_01_sfnt_off0000cc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC98 10320 bytes
SHA-256: 77c0814e6b9f8e517d1dd31415edb456471fa15ee12ae3212fe82ba03fd277f8