Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57e6e2d8bce192d…

MALICIOUS

PDF

39.8 KB Created: 2020-11-07 22:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 0596263411d8d4e1b5cde2c86cb4e063 SHA-1: 12719e95da9d79024ad01ea5c899d484705b9000 SHA-256: c57e6e2d8bce192d94c7744ff61830828ccbe26c3a950197b6b575ca4c30b2ff
126 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/aws?keyword=employee+evaluation+form+word+doc PDF link annotation
    • https://natulawud.weebly.com/uploads/1/3/4/3/134309077/feb65e82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_5fa062195bad7.pdfIn PDF document text
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/ae8178d294595d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369323/normal_5f9a610c6d17f.pdfIn PDF document text
    • https://zupelewelasilag.weebly.com/uploads/1/3/4/5/134594614/nafilujajuwoge_zemij.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/1d1f8ecc085ca.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/sijuwoxujupid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/senodiw/50290291792.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/vifinimotudokewesixox.pdfIn PDF document text
    • https://jazefev.files.wordpress.com/2020/11/bestwap._in_punjabi_song_2019_video.pdfIn PDF document text
    • https://bejafasuba.files.wordpress.com/2020/11/44120928770.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_off00005e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E59 5332 bytes
SHA-256: a688e89bcd298a04b4194cd7d8d1170999d81da914cf40b78ae6685f39614d07
font_01_sfnt_off0000708d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x708D 10148 bytes
SHA-256: dd468781e23259a8d13bc23a1395df123b2b65a88d9629ed8871d355c2ae7c97