Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b40d37d0df5304…

MALICIOUS

PDF

67.8 KB Created: 2021-04-07 00:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e02261aaee15fc750d56fa6baace79b5 SHA-1: 09ceed83a686cbff7efe4fb9c12890cc86ec6dd2 SHA-256: 11b40d37d0df530494450ea0254cc81e89faabf1ece18eba2704279b9003d625
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://leonvi.ru/123?utm_term=api+gateway+authorizer+terraform PDF link annotation
    • http://rogosevit.22web.org/schistosoma_disease.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_604b3de017473.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403263/normal_5fc6d52dbe923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_60216da24a86b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471959/normal_60554a3690931.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/adobe_creator_software_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_601702099e526.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/kurorusuzapoz.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/how_do_volcanoes_affect_the_environment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488135/normal_602708ffa7a6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://revodez.myartsonline.com/biochemical_pharmacology_textbook.pdfIn PDF document text
    • http://vejojivusuze.rf.gd/76111983047.pdfIn PDF document text
    • http://mipojumujudi.rf.gd/little_house_on_the_prairie_season_8_episode_5_cast.pdfIn PDF document text
    • http://rorufefujolag.rf.gd/41257279574.pdfIn PDF document text
    • http://xewaxal.epizy.com/wow_classic_boomkin_guide.pdfIn PDF document text
    • http://xenelerowem.rf.gd/movimientos_articulares_de_la_cadera.pdfIn PDF document text
    • http://fepusum.onlinewebshop.net/xokebegawuponisopev.pdfIn PDF document text
    • http://maguvotu.rf.gd/68321082486.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/roxetuxosulugabofiz.pdfIn PDF document text
    • http://nadinuvuxogi.epizy.com/zijefij.pdfIn PDF document text
    • http://joluluseliwawi.rf.gd/black_bourgeoisie_download.pdfIn PDF document text
    • http://medazupu.onlinewebshop.net/vishnu_sahasranamam_sanskrit_hindi.pdfIn PDF document text
    • http://tuzagexesowojoj.epizy.com/tamil_movies_2017_tamilgun.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_off0000c914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC914 5340 bytes
SHA-256: c07aaed026b96ad39ae548f7f73b96ddeaeca3f8c27b80aa2a2e47ba07cd444e
font_01_sfnt_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 10828 bytes
SHA-256: 485713c473c703560979ffeaffe3f09373e101a090a143b808901b84e12c7316

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