Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ec68657e0d7fe7…

MALICIOUS

PDF

86.3 KB Created: 2021-05-03 05:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a36788bbf0d9ca03d5624a733071ccd4 SHA-1: d96b4af7aca4a111243c6b4d9ad646a91dd76649 SHA-256: f6ec68657e0d7fe738040fcef46cdfd967192f7784b8d77ce78e2f4edb77bb57
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic firings and numerous embedded URLs suggest this document is designed to redirect users to external sites, likely for phishing or to download further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a link farm on disposable hosting, further supporting a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=un+ensayo+de+comparaci%25C3%25B3n+y+contraste
    • https://tasiwusod.weebly.com/uploads/1/3/5/3/135351817/fedisipesipajav.pdf
    • https://static.s123-cdn-static.com/uploads/4499958/normal_600538b2a878d.pdf
    • http://kinemulawaw.sportsontheweb.net/devuruxezu.pdf
    • https://cdn-cms.f-static.net/uploads/4470980/normal_5fe9b00f89125.pdf
    • http://kedepoba.sportsontheweb.net/74299040492.pdf
    • https://cdn-cms.f-static.net/uploads/4467945/normal_603333b3b734c.pdf
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/golixotufevemodi.pdf
    • http://xojanefod.mygamesonline.org/nanotechnology_in_wastewater_treatment_project_report.pdf
    • http://lorozetuwivu.medianewsonline.com/mechanism_of_general_anaesthesia.pdf
    • http://vozivovog.scienceontheweb.net/activities_for_very_young_learners_cambridge.pdf
    • http://kofojoxake.mygamesonline.org/amsco_apush_chapter_11.pdf
    • http://wojurimaxab.mywebcommunity.org/how_to_mix_jolen_bleach_cream.pdf
    • https://static.s123-cdn-static.com/uploads/4476135/normal_5fec12c66bbd7.pdf
    • https://levusukep.weebly.com/uploads/1/3/0/8/130814129/xuxuroxugulibu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sabozet.epizy.com/select_multiple_sheets_in_tableau_dashboard.pdf
    • https://93a2b5bb-aecd-41dc-861f-07dcdefec443.filesusr.com/ugd/dee83c_af156bc0f79a4b6a9bc1fb56437000f1.pdf?index=true
    • http://lesexuxu.rf.gd/furofinavivupude.pdf
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_bd87061c7f8341e8bd3bd7d52c392403.pdf?index=true
    • http://lufafutogixafu.rf.gd/guralewizupenesotojov.pdf
    • http://zevuketeno.rf.gd/cintas_holiday_inn_express_uniforms_2019.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011199.bin
a68a7aaa021bbfbf99e7a605897392c0fd55e1a264a46e846c7b2806cea25d9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 5416 bytes
font_01_sfnt_off000123b9.bin
d0b435e103f7f077b4d94a1a3c25d2e414f582dc1ff4be24b227392a5993c333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 11608 bytes

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