Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31fefb79be35dd8…

MALICIOUS

PDF

74.9 KB Created: 2021-06-05 11:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: da2059d12189920e2c903bb154faf67b SHA-1: 22372490096b0bc1bc7d7d92bf8cd43474f6196b SHA-256: d31fefb79be35dd88dc41d580a80ef6fde82bf63294cc65c7896328aeb0be25e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary malicious URL identified is https://smidgel.ru/pbw?utm_term=final+fantasy+8+remastered+walkthrough+pdf, which is presented as a walkthrough for a game.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/pbw?utm_term=final+fantasy+8+remastered+walkthrough+pdf PDF link annotation
    • https://fuviwezajoz.weebly.com/uploads/1/3/1/3/131379384/vobogigipuso.pdfIn PDF document text
    • https://luvupomadimudux.weebly.com/uploads/1/3/4/3/134350134/pademifudani.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500001/normal_600291fd2bb5e.pdfIn PDF document text
    • https://lilufegat.weebly.com/uploads/1/3/5/9/135965666/c32bdd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485702/normal_6001e152623b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527237/normal_602d283d87617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_5fe80ed6f158a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_605ef0a925830.pdfIn PDF document text
    • https://xogotosab.weebly.com/uploads/1/3/4/3/134327909/3e162c3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_6016b68492af0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_605a6cfc93c28.pdfIn PDF document text
    • https://meduxivanudi.weebly.com/uploads/1/3/4/8/134871921/8750324.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410962/normal_60bb04569b30e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lijegazoz.pbworks.com/f/tiponemekipurusikiviseb.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/32323025614.pdfIn PDF document text
    • http://siwuromo.pbworks.com/f/twilight_saga_part_3_full_movie_in_hindi_dubbed_download.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/w/file/fetch/144477372/what_is_the_principle_of_ir_spectroscopy_and_its_application.pdfIn PDF document text
    • http://metudebebi.pbworks.com/w/file/fetch/144658272/sikunapojigafinukevuwesok.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144412482/swift_reloading_manual.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/nomenclature_of_bicyclic_organic_compounds_download.pdfIn PDF document text
    • http://zuvevetub.pbworks.com/w/file/fetch/144578262/a_streetcar_named_desire_scene_2_characterization.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/11659084244.pdfIn PDF document text
    • http://vosebim.pbworks.com/f/lelabowulix.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_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 5864 bytes
SHA-256: a830043514aaca46f8913b6f89185bc539243b19b70ac805bbf8bc18e23ac7ce
font_01_sfnt_off0000f9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 10608 bytes
SHA-256: 9a7d3b4a1d23134ef0f270bc4fec5bcc9f6bd15e8d382099c4259609c1fdb074

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