Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8af5da59fbd55f…

MALICIOUS

PDF

77.7 KB Created: 2021-04-04 16:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2a8e852fae6b8544292944e8bb18b5b3 SHA-1: c03dbd0de8de9908b5ea5263987520f8f251d801 SHA-256: dd8af5da59fbd55fbfc9004ae33214772e36da82047de03f1d95f314bf1a70ff
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's part of a link farm designed for SEO manipulation, further supporting a phishing or malicious redirection attempt. No scripts were extracted, but the presence of embedded URLs and the ML detection are sufficient indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/wix?keyword=captree+fishing+weather+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481161/normal_602ab8d815d7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475194/normal_601b01317df13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421630/normal_5fd995545529b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458849/normal_5fc7d846116af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495055/normal_60403252c56c6.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/76923308348.pdfIn PDF document text
    • http://tehnikator.ru/seth_godin_blog_every_day2kwro.pdfIn PDF document text
    • http://melowimaz.getenjoyment.net/17253825736.pdfIn PDF document text
    • http://fb-ig-copyright.com/besos_para_ti_meaning2ugee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5ff8fd1a8378c.pdfIn PDF document text
    • http://dominis.xyz/american_literature_association_2019_programr5jcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408881/normal_5ff16df356d66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_602c1f49ce4c3.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/how_to_top_up_transmission_fluid_vt_commodore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7ac7aeea-3827-48b0-8903-0f4e211b8581/theorems_about_parallel_lines.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/80949059095.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/mazetaworezajaluxalaf.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/the_fire_next_time_bible_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ec8dba7-c53b-4710-913a-5aca8014b2f8/dadesubejujeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5625863-c157-49a0-bc33-29a5c016b7d3/aircraft_maintenance_tech_resume_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/19494121321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b2cd09-d436-419b-95c7-63e429acc1f3/how_to_service_a_ford_ranger.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_off0000e4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B8 5036 bytes
SHA-256: 546a4c3dc4c11aff102bb43fdc2030b903ee7d0fc4255bc9a622f337c09ccb9d
font_01_sfnt_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 10940 bytes
SHA-256: becfcc2d276a562191ce81d22e5598729ab2f3ec865bcd5cbce614f7972fbc6c
font_02_sfnt_off00011b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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