Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c39cd6b578e1ced…

MALICIOUS

PDF

68.5 KB Created: 2020-10-02 19:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: f80bb4e7a0045b1a0aa611b8063eaf83 SHA-1: fd8492b61ebbd37520174fe4af29ebd1a6c1233b SHA-256: 0c39cd6b578e1ced830f5faea219030b266704bd443d8e368f30098f941d8c0d
184 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.
  • 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://ggtraff.ru/strik?keyword=respuestas+examen+teorico+clase+b+2019+pdf In PDF document text
    • http://xelut.cocoscafe.ca/uploads/1/3/0/9/130968915/56ef902d412.pdfIn PDF document text
    • http://files.elginparkathletics.com/uploads/1/3/1/4/131406413/xikudenaw.pdfIn PDF document text
    • http://files.watchyourhead.ca/uploads/1/3/1/1/131164174/1916354.pdfIn PDF document text
    • https://site-1036988.mozfiles.com/files/1036988/55890799658.pdfIn PDF document text
    • https://site-1037266.mozfiles.com/files/1037266/53757427661.pdfIn PDF document text
    • https://site-1039148.mozfiles.com/files/1039148/61436193740.pdfIn PDF document text
    • https://site-1038470.mozfiles.com/files/1038470/81432692162.pdfIn PDF document text
    • http://files.kuntrykornermobilehomes.com/uploads/1/3/1/6/131637649/xosikezaw.pdfIn PDF document text
    • http://files.nikkosbread.com/uploads/1/3/0/8/130814907/6577365.pdfIn PDF document text
    • http://files.audramiddleton.com/uploads/1/3/0/9/130969226/1507941.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A9 5996 bytes
SHA-256: 448e7c0471abb61595d81994d1711d6362896824e6d60949c915ba25aae4efbd
font_01_sfnt_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 1936 bytes
SHA-256: cf50d13c5c21d2e34fba0d9dd21119d4839fc35fdaebfe62cbacf51850cc328d
font_02_sfnt_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 11876 bytes
SHA-256: 7b9d7d8ebd3dee986925a9f037c1e150ede63647b7371a94fd9d73b883fc218b