Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c15853d36b49c0…

MALICIOUS

PDF

76.2 KB Created: 2021-05-12 10:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 599cabc9d632cf3a73c8f2e49ca6289c SHA-1: 20c1520ff3dc737ea5b344caede43bc2997a1057 SHA-256: 13c15853d36b49c0e08c65c6a82d2671fe9193e518692043596092f8937dcd5e
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a high concentration on disposable hosting and domains associated with link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/strik?utm_term=active+and+passive+voice+online+activities PDF link annotation
    • http://zaxiluxedexu.getenjoyment.net/41810047930.pdfIn PDF document text
    • http://biwumani.mywebcommunity.org/83375828446.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/the_goldfinch_donna_tartt_free_download.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/17797140825.pdfIn PDF document text
    • https://negowuvezesat.weebly.com/uploads/1/3/4/8/134859399/93e0cb0.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/ranodirelomujatisag.pdfIn PDF document text
    • https://voromelub.weebly.com/uploads/1/3/4/8/134872571/gutonerasuteriz-pevibutofenoba-tatob-suxeb.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/xotuwavo.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/blender_fluid_tutorial_2.82.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b26015e-4163-463c-9404-5c1f94e2ea19/how_much_psi_for_pressure_washer_to_clean_concrete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be69863-15d4-455a-9117-39da8ab8921e/21760480667.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/21717925788.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/wofupokexovirif.pdfIn PDF document text
    • https://012a8781-80b6-4d33-8f63-56d56ef93f15.filesusr.com/ugd/6d3794_f6c1264af37548c4b26ef3479f0e5f32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/kesemefowinezejitilogaf.pdfIn PDF document text
    • https://de461234-8179-4892-b46d-67dc01ae00af.filesusr.com/ugd/69bbc5_178340b7d7ec49ffa0111c60d4fefe00.pdf?index=trueIn PDF document text
    • https://40ba1f7a-6e91-49bb-bbb8-dfbb40a2bc60.filesusr.com/ugd/22bf55_661ed87f664e4a0fb2c3e0804ff19bf9.pdf?index=trueIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_483663ba186f4c50b7d2b5125ea6c21f.pdf?index=trueIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_19350c8f19e14e4c8c59a74b530860ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/best_bark_collar_without_remote.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/relion_lancets_ultra_thin.pdfIn PDF document text
    • http://gofumakexoj.onlinewebshop.net/endometriosis_rcog_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/zeduwexunavivusube.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_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 5020 bytes
SHA-256: b83f883940ebd888f154b68d06cb093d896f736ecb0a3c3b82e20d82a007c2f1
font_01_sfnt_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 11404 bytes
SHA-256: 22a5ee8879a729cac7fc204e2df050904113c67101ca0153a15fa03a13ccf3dd

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