Malicious PDF — malware analysis report

Static analysis result for SHA-256 d319869d024fbf77…

MALICIOUS

PDF

91.1 KB Created: 2021-03-09 01:03:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: bd25ed1a35da679ea70184fbd61cfab3 SHA-1: 98a89dfe8e8edb6f3e5b755c0f16032b31c1c446 SHA-256: d319869d024fbf772ff03bd0bbe91504d40a3d3a81ef43e45552baba28daa449
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and potentially malicious, with a high ML score and ClamAV detection. It contains numerous external links, many pointing to disposable domains, suggesting a phishing or malware distribution scheme disguised as a document about learning strategies. No scripts were extracted, but the presence of external links and the nature of the heuristics indicate a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/award?keyword=estrategias+de+aprendizaje+visual+auditivo+y+kinestesico+pdf PDF link annotation
    • http://pafiwuz.66ghz.com/beyond_good_and_evil_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403824/normal_602177f6db946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378613/normal_5fe8eddac529c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477138/normal_5fecf6943d00a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_602df16a58750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_60205f754323a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388293/normal_5ffd42d7ea0d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_601d0e6887f0f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404966/normal_5feb4f998c602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453338/normal_602680653b403.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sofujupoxalup.rf.gd/47371282641.pdfIn PDF document text
    • http://parorusoba.rf.gd/14090234270.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_237588d30a9248a18675e8ac90b22876.pdf?index=trueIn PDF document text
    • http://rodobokojezaga.epizy.com/dajosofa.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/47544860858.pdfIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_cf3209ef0d014e7abb6c8d570ff617b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/funny_tricky_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/bhola_hai_bhandari_dj.pdfIn PDF document text
    • http://vinuvomitatu.epizy.com/how_do_i_reset_my_sony_bravia_tv_back_to_factory_settings.pdfIn PDF document text
    • http://wivonubezur.epizy.com/441012006.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_1dce1d92ce274a9fb6874387bdc6fbdd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/33148748932.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/12706276488.pdfIn PDF document text
    • http://jukiwifid.rf.gd/3732190271.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_off0001207d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207D 5632 bytes
SHA-256: 36c7fccf3da516d285d6cbff0bfa3cd6390750219ad581fcdcd15b6fdd67a93c
font_01_sfnt_off000133e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E1 12688 bytes
SHA-256: 44e4dbadf8b3a5fe3f11c6da92281ae78ca98eb0bd39ca8a3bc4a1443032a5d5