Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5e4f82ef9bc02d…

MALICIOUS

PDF

80.6 KB Created: 2021-03-15 22:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8992e9441d2fafc467d4b7e178cc7f86 SHA-1: 7d03ccdf6c27bb4350fc415604670c3c5ecbecc4 SHA-256: 3d5e4f82ef9bc02d8c59e70a88656a4bff3f66abc26d949917584738bbfa4fe4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct textual lure is discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://soxebez.ru/strik?utm_term=notas+para+teclado+canciones PDF link annotation
    • https://cdn.sqhk.co/ruxuzobisu/hcNFihj/piggy_book_2_secret_skins.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/eggiePv/mcat_scores_for_medical_schools_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/iejbgcg/schleich_42481_farm_world_spielset.pdfIn PDF document text
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/pigorop.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/wotebabapos_xixumef.pdfIn PDF document text
    • http://dugarudewemudo.sportsontheweb.net/bar_chart_and_histogram.pdfIn PDF document text
    • https://zegazofegu.weebly.com/uploads/1/3/5/2/135296009/lelupilowik.pdfIn PDF document text
    • http://pifovabu.getenjoyment.net/focus_on_ielts_new_edition_answer_key.pdfIn PDF document text
    • https://tupodoki.weebly.com/uploads/1/3/0/7/130776149/tezuwol.pdfIn PDF document text
    • https://cdn.sqhk.co/rawatajizefu/jfQdhgC/basketball_shooting_shirts_designs.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/gihu7gf/wuvarulivo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nenilezum.epizy.com/2020_cbr1000rr_service_manual.pdfIn PDF document text
    • http://rizibapuzaduxe.epizy.com/akeeba_backup_joomla_3._x.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/sidizoteri.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/microsoft_word_cover_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/29238887808.pdfIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_2e0351918c1d4ec59609eb67800463c7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tudawufed/wodasiwotiwabovagufax.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/first_grade_handwriting_worksheets.pdfIn PDF document text
    • http://bolirazebaf.myartsonline.com/jekutaxekuju.pdfIn PDF document text
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_bda83bca9b304e5e99ba623b161d84f6.pdf?index=trueIn PDF document text
    • http://rijonitapadon.myartsonline.com/how_often_should_a_first_aider_receive_training.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_cdba18d29e294e649955de639a027f63.pdf?index=trueIn PDF document text
    • http://fezilavitaj.epizy.com/how_to_stop_air_conditioner_from_leaking_outside.pdfIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_d028949063e34081a3fe316684042f94.pdf?index=trueIn PDF document text
    • http://ziwufuv.rf.gd/sevetij.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_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 5036 bytes
SHA-256: 9dd2130827ae9ffb0449f0f6dcefaff07f95eb32cd104945cd70d3bb3178eae9
font_01_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 12628 bytes
SHA-256: cefb8793faf9fcada36c92576a833e322118ad44823e37e337667163d53eed3e