Malicious PDF — malware analysis report

Static analysis result for SHA-256 f339b52fa4c0314a…

MALICIOUS

PDF

92.8 KB Created: 2021-04-08 06:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e27542a9b29639f94ff2074c608f6d0b SHA-1: df15a14f18b06b59446a7eb2b47a12436118bcee SHA-256: f339b52fa4c0314a12353283f311a9f188c4e1bed3f8343cdbf49c3ac5bfb7c1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and ML classification. The ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature. The primary attack pattern involves directing users to phishing or malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/strik?utm_term=picture+quotes+of+simplicity PDF link annotation
    • http://neojust.ru/ziraloraba3c0jl.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/radio_shack_scanner_mods.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444655/normal_6023d59a6e51b.pdfIn PDF document text
    • http://pravagims.net/872344415064pj9o.pdfIn PDF document text
    • https://sosepokapebovi.weebly.com/uploads/1/3/0/8/130814645/fivitetomazomil-pinawadivil-pazipe-debusorujijuji.pdfIn PDF document text
    • https://nebuxegakox.weebly.com/uploads/1/3/4/4/134404726/153337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_6019ac2b038ef.pdfIn PDF document text
    • http://honey-love.ru/business_model_strategic_thinkinguwbum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474979/normal_5ff473e7bebb6.pdfIn PDF document text
    • https://fijogukovope.weebly.com/uploads/1/3/1/3/131379832/1972975.pdfIn PDF document text
    • https://didunoduwogu.weebly.com/uploads/1/3/2/6/132682107/3778239.pdfIn PDF document text
    • http://inostrana.com/99112359354cpm2w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369904/normal_5fc61995ce46d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_5fd70442ee725.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/tecnicas_de_redaccion_coherencia_concordancia.pdfIn PDF document text
    • http://kostlike.site/wheel_of_fortune_pc_game_10zk9u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/netinuwa/abc_radio_app_android.pdfIn PDF document text
    • http://tiwosutodegadax.onlinewebshop.net/30803118966.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/how_to_reset_ozeri_scale.pdfIn PDF document text
    • http://wewonak.rf.gd/canales_de_distribucion_internacional.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/79138434297.pdfIn PDF document text
    • http://sinijukiju.epizy.com/wildgame_innovations_terra_extreme_14_megapixel_ir_trail_camera_still_images_and_video_bark.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/8855059631.pdfIn PDF document text
    • http://zemadepa.rf.gd/complete_meditation_guide.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_off00012c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C61 5180 bytes
SHA-256: d4757f10e3d573e2e3abe2c355ae7a2e2ca48a1e6518fef28d36d4b94ffc1aca
font_01_sfnt_off00013e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E02 11176 bytes
SHA-256: 9a8ab22f4794df3fec60f796a492a1c006a198842da77635aede98c0e603a46d