Malicious PDF — malware analysis report

Static analysis result for SHA-256 51aa092d3f309cc3…

MALICIOUS

PDF

83.1 KB Created: 2021-03-17 01:20:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 42071c74b0474a93f71d9ef4a33b171d SHA-1: 403954b5406cfd779f0c6d259ea763f716678ba3 SHA-256: 51aa092d3f309cc3867995a51d5f63e4ae7eea986945eada9b030a9e9d8692d2
74 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a malicious document, including a high ML classifier score and the presence of external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm hosted on disposable domains, suggesting an attempt to distribute malicious content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the overall structure and heuristics point towards a malicious PDF designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/award?keyword=wonky+donkey+book+pdf+free PDF link annotation
    • https://cdn.sqhk.co/gubisagebuto/vDggU0w/scary_ice_scream_scary_neighborhood_creamer.pdfIn PDF document text
    • https://cdn.sqhk.co/temegolu/gfgdhap/pafawujep.pdfIn PDF document text
    • http://tifizutolakefu.22web.org/zudun.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/ziwekov_jonigitenes_gedonezasebavi.pdfIn PDF document text
    • https://cdn.sqhk.co/fojevimexu/jggBjd4/pop_time_popcorn_spicy_jalapeno.pdfIn PDF document text
    • https://vitovoraf.weebly.com/uploads/1/3/1/1/131164311/cb8893509766ce.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/bavizukitarazanu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jomewudixaf.epizy.com/frm_part_2_sample_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/jevuxug.pdfIn PDF document text
    • http://vibesevazetiv.rf.gd/manager_are_born_or_made.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_0f004fbe4b654b8888f68b978cc63fee.pdf?index=trueIn PDF document text
    • http://wuvoxebegef.rf.gd/reading_and_writing_curriculum_guide.pdfIn PDF document text
    • http://fikuputo.epizy.com/jafujuzegu.pdfIn PDF document text
    • http://fibejebovef.epizy.com/artist_management_books.pdfIn PDF document text
    • http://dimegebewode.epizy.com/deganadugotupovorejijema.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/vaxizu.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/ethiopian_airlines_crash_preliminary_report.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/98360306646.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_fb8fabd6d2504ae7ac82a48228776d19.pdf?index=trueIn 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_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 4932 bytes
SHA-256: 63eecb110d77f13512c211064dce307ab74fef9f63ae4d44d888848fadfa2e8d
font_01_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 11356 bytes
SHA-256: c5174d35196cfb9dcb11f096d063df325509654e1b8b7d96cea9af6ddf06970a

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