Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb4e42abbc7de85d…

MALICIOUS

PDF

46.9 KB Created: 2020-10-04 11:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 7e3ee0cc4b8c7699d1f74afbdd02928f SHA-1: 2a44b1a0d02cf43a473aa73588c6737feab3ed91 SHA-256: fb4e42abbc7de85d6925b4ffb9531b4df21bf2018d62a61e8bc352ee3a2d5361
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://gettraff.ru/strik?keyword=aurelius+augustinus+confessiones+pdf In PDF document text
    • http://files.b-khairbooks.com/uploads/1/3/2/3/132302941/ad8d6163.pdfIn PDF document text
    • http://files.elicranor.com/uploads/1/3/1/1/131164159/4909452.pdfIn PDF document text
    • http://wepusegi.sp-arms.com/uploads/1/3/1/4/131453718/jefojowatinizi_vojifizas_zizawofelilebad.pdfIn PDF document text
    • http://pusegif.danacopeconsulting.com/uploads/1/3/0/7/130740164/gakeweva.pdfIn PDF document text
    • http://files.selfadvocacyandstrength.org/uploads/1/3/2/6/132681694/195ce.pdfIn PDF document text
    • https://site-1037152.mozfiles.com/files/1037152/98857533476.pdfIn PDF document text
    • https://site-1038332.mozfiles.com/files/1038332/rifajubeves.pdfIn PDF document text
    • https://site-1038495.mozfiles.com/files/1038495/vakurajatob.pdfIn PDF document text
    • https://site-1036820.mozfiles.com/files/1036820/58552553331.pdfIn PDF document text
    • https://site-1037130.mozfiles.com/files/1037130/41256819842.pdfIn PDF document text
    • https://site-1037180.mozfiles.com/files/1037180/pikukerefibugubavuvul.pdfIn PDF document text
    • https://site-1036824.mozfiles.com/files/1036824/89925288598.pdfIn PDF document text
    • https://site-1039261.mozfiles.com/files/1039261/janebobebujobux.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7725 5312 bytes
SHA-256: 2a3e4b4e883fea81013c9cad684492050043379d7058e8e0144d5de6d0cff903
font_01_sfnt_off00008946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8946 11432 bytes
SHA-256: e86d6d1a287321db8336f9bd3f16f818697964db465b49327677b2383b566e3a