Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8f6bb995e0d5fd…

MALICIOUS

PDF

80.6 KB Created: 2021-03-17 07:49:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d32de71249f84f357f0fe94800b2b9fe SHA-1: 4f1b89ae9d722e24e3649f6662fe325749d07806 SHA-256: df8f6bb995e0d5fd0f46ea0cf98a982bb63d43b9c4ee4258738d3392b30a5af6
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URIs and the heuristic indicating a link farm on disposable hosting points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=elements+of+drama+5th+grade+worksheet PDF link annotation
    • http://tesupelaj.sportsontheweb.net/68165339107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389095/normal_5fcd73baa3d8d.pdfIn PDF document text
    • http://lujadexezusunam.22web.org/dilokavetuzevinibizovov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480736/normal_604caa5c99170.pdfIn PDF document text
    • http://biomaniix.website/autodesk_plant_3d_viewere35uy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386828/normal_5ff308a2ac835.pdfIn PDF document text
    • http://greyfruit.space/kalizilutepkdhtx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5fe5b1a7af16b.pdfIn PDF document text
    • http://keysecret.ru/10_things_that_are_now_illegal_in_a_relationshipmvz91.pdfIn PDF document text
    • http://toppiksnack.xyz/lefajolevukilutanetutoww1n26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_603b1d28059f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_602d9f894c98b.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/zinubowazepe.pdfIn PDF document text
    • http://playmarket-online.com/46829350406dx2fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_600f2054cacf8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_9e0400ef013e4f77ae0443e835bdd82d.pdf?index=trueIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_672c2d1fb0e047b6a01976a104a51465.pdf?index=trueIn PDF document text
    • http://vatasinunevuto.epizy.com/kevuwedamudesarifo.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_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 5560 bytes
SHA-256: 4c1610001c760977ebdb9847a32c726702d582b10b59ded989418188c932359b
font_01_sfnt_off00010c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 11488 bytes
SHA-256: 4bb69d4a1e7b9ff819317128b7d2bc3e3d9bc4fa1c20b8674a76b2d280318a35

Open this report in the interactive analyzer, or submit your own file for analysis.