Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb207ae23de7bf29…

MALICIOUS

PDF

79.1 KB Created: 2021-04-30 22:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d2805fcc36033560759d9e2bb1a47107 SHA-1: d0f04ab41e222c06df6fccbdd0c12cdc6c97c39b SHA-256: bb207ae23de7bf29fd8a97d4c5d9d2d10af8f28d749c60c334a82e5a8674f2ca
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on a link to 'resalured.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=is+evcon+a+good+furnace PDF link annotation
    • http://tekirivira.iblogger.org/adjective_clauses_with_object_relative_pronouns_exercises.pdfIn PDF document text
    • http://apparentlyopt.com/nursing_dosage_calculations_printable_worksheets1ok6t.pdfIn PDF document text
    • http://erogan-oficial.site/90580016101nk6xs.pdfIn PDF document text
    • http://mirror-x.org/puzuxeq5fxz.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/Yjje7Q1/66504093871.pdfIn PDF document text
    • http://idealslimitaly.site/4018238169191zex.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/fghNPha/5666851592.pdfIn PDF document text
    • http://jilet2.club/factual_report_sampleijpab.pdfIn PDF document text
    • http://gouliwer.online/81756673153iaqwb.pdfIn PDF document text
    • http://blubadgehelp.net/miwopefexajajika38ct.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/hghbXhf/parachute_cord_mask_lanyard.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/bhIbehd/porsche_driving_experience_atlanta_georgia.pdfIn PDF document text
    • http://auth02mobility.com/nilosaguvute1vso5.pdfIn PDF document text
    • https://cdn.sqhk.co/musamari/xjgJvjd/56184619748.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/kegubinefuda/74130383586.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/35889499348.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/heigan_the_unclean_guide.pdfIn PDF document text
    • http://pigasupozev.epizy.com/34977234483.pdfIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_d461c8b258bc45d194b6ca93379f2668.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_5c6ca5c7578548dca402a5bd23b8b3f4.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_33cecda4e7c6409e8ef46cf41b340bbd.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_585731b9e6054cfab224d49016452054.pdf?index=trueIn PDF document text
    • http://dorowoz.rf.gd/answer_back_meaning_in_sentence.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_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 5156 bytes
SHA-256: 9dcacf5baf4486fa6ad97e19c448cfce54f60a28699566bc56a0d1c1fb2108b4
font_01_sfnt_off00010b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B13 10672 bytes
SHA-256: 84168648e888a90f0a2d1302e144e1fa64d34c444ef2066ec8d246ca4111758f

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