Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e6e358f328d4b7…

MALICIOUS

PDF

35.3 KB Created: 2020-11-05 16:15:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2014ed55f98cf2e35e4cb6d4cd7acdfe SHA-1: 21c4e18e6e750ed06ed786280dce496f885543ce SHA-256: 18e6e358f328d4b7c49469d772d4d0a7db34ad1e7a167c4a3a1fc12c1a06d573
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded URLs, with one prominently displayed as 'Directions to wichita marriott'. The ML classifier strongly flagged this PDF as malicious, and heuristic analysis identified it as a link farm on disposable hosting. The presence of multiple Weebly and other disposable hosting URLs suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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=directions+to+wichita+marriott PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f89f7ed68136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f9d699ad67dc.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/numizuxivu_nilifo_kudufuzit.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/kipifamoj-jedupesexava-tokatidalivo.pdfIn PDF document text
    • https://nugaramavamog.weebly.com/uploads/1/3/4/3/134320686/rewopesix.pdfIn PDF document text
    • https://kotonimurapuva.weebly.com/uploads/1/3/4/4/134440920/worawolirosa-nurajikofo-fadevixosemipoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391915/normal_5f9739f145fe7.pdfIn PDF document text
    • https://lulitetuxopibol.weebly.com/uploads/1/3/1/1/131164377/133db78e9dd16a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417536/normal_5f980bfba2e30.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/gipug_xuvuzipufiwipob_fafilu.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/a148ddfa-dd99-4471-b047-058ca6260619/toolbox_for_mcpe_mod_apk.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_off00004a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A99 5096 bytes
SHA-256: a8891ee6d2fc37630e555233bb5eacf4046a992a96c48704356018ccb50c5968
font_01_sfnt_off00005bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BDE 10840 bytes
SHA-256: ccdc65e079fe1fb85b5373a8c2e27226c0902fe7df5f32db8fdc35f79d229995

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