Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3908cbfbba92a4d…

MALICIOUS

PDF

35.9 KB Created: 2020-10-03 09:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: bac5471a78fdcce82fba0025eace1f13 SHA-1: 62bdbd98f82fb69746871079bbc9adc4afd8669f SHA-256: d3908cbfbba92a4d66d62b2d0c75faab1c520684cb96117b0054813242fcd9a3
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=pathways+reading+writing+and+critical+thinking+2+2nd+edition+pdf In PDF document text
    • http://files.creativeplansandservices.com/uploads/1/3/2/7/132710712/63b5c506cd.pdfIn PDF document text
    • http://files.azzurebeauty.com/uploads/1/3/1/3/131380042/waponerurewe_mevat_xiruvig_wifutasoriluxik.pdfIn PDF document text
    • http://files.aandwtransport.com/uploads/1/3/0/7/130738637/wirifajiserotusug.pdfIn PDF document text
    • http://files.ghumc.org/uploads/1/3/1/8/131856339/4672012.pdfIn PDF document text
    • http://junekaki.annagartshore.com/uploads/1/3/0/8/130874498/9380f2ad.pdfIn PDF document text
    • https://site-1037138.mozfiles.com/files/1037138/21576321996.pdfIn PDF document text
    • https://site-1040339.mozfiles.com/files/1040339/jasenusumuvebut.pdfIn PDF document text
    • https://site-1043160.mozfiles.com/files/1043160/17544157844.pdfIn PDF document text
    • http://sejog.jyliannmariedavis.com/uploads/1/3/1/8/131872225/33e2f6.pdfIn PDF document text
    • http://files.431775997417950473.com/uploads/1/3/2/8/132815359/8477575.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/1/0432/0736/0667/files/77801663235.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_off00003f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F8D 3404 bytes
SHA-256: 4ceea26d96a360773bda10f74658e8cc78cbc75c9055df7067dcfa8c361c1321
font_01_sfnt_off00004bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BBE 5808 bytes
SHA-256: 909efb493a318726d790224f381db67a9e573c96b88ac4440aac4ced7644a26a
font_02_sfnt_off00005f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9B 10032 bytes
SHA-256: c6c6d6b9f2a7dc77c6befc79c9b881a069fb5e377c86d3916683b20063cc415b