Malicious PDF — malware analysis report

Static analysis result for SHA-256 a345a74c53fa1f28…

MALICIOUS

PDF

44.7 KB Created: 2020-09-30 12:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: ad9ebaa93bcf2789d1d9870fd339b6af SHA-1: 91ff11763202d8981f3d6847b50c2a49b4004afa SHA-256: a345a74c53fa1f28d23d4f60fe1508b5e24038a3e17cdab31e17695b19c37f2a
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://cctraff.ru/strik?keyword=libros+para+aprender+ingles+pdf+para+descargar In PDF document text
    • http://files.ssimovement.org/uploads/1/3/0/7/130738779/e39a3.pdfIn PDF document text
    • http://xupuge.bucketofsudsnc.com/uploads/1/3/1/3/131378850/6c50ec2d1881.pdfIn PDF document text
    • http://files.remodelingbydonvancura.com/uploads/1/3/1/4/131407395/8982097f8.pdfIn PDF document text
    • https://site-1036815.mozfiles.com/files/1036815/49087958048.pdfIn PDF document text
    • https://site-1036991.mozfiles.com/files/1036991/9430807188.pdfIn PDF document text
    • http://files.mckinneyfalls.org/uploads/1/3/0/8/130813934/padinibobut_damuvakosi_sejokiso.pdfIn PDF document text
    • http://files.canadiancoachbaker.com/uploads/1/3/2/7/132740838/mezebevawiserap.pdfIn PDF document text
    • http://fabitane.greaterraleighchapter.com/uploads/1/3/0/7/130739629/jogulagavopu.pdfIn PDF document text
    • http://files.emanuelacooper.net/uploads/1/3/1/8/131856333/dokajexuxeveris.pdfIn PDF document text
    • http://files.lillybellaboutique.ca/uploads/1/3/1/4/131455832/d5a9be2e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e4ad672-0caa-4010-9598-390e1f164c10/3834378832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ea74078-f929-4723-85e6-46a527000804/94555736678.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61E6 5404 bytes
SHA-256: 60b0d49664c34af05b0a37c27b5164eced69ecd95d747b711addbf6fbd0db40a
font_01_sfnt_off0000744b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x744B 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_02_sfnt_off00007dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEC 11548 bytes
SHA-256: c452d787b4cc2e1e7c1a86c284fc2b54cf279a5de83604bba35bf69baae34bea