Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8a35f023c91811…

MALICIOUS

PDF

80.0 KB Created: 2021-05-04 19:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 767970a1bff9d4d285c6e00422340d17 SHA-1: cb9fa966b98aa6c4ac5150dac7368dd526a86101 SHA-256: 3f8a35f023c918115369bc40a4d5c7bafc32ffd55e2b5fa8e5ddb1fede074682
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic further supports the phishing pretext, implying the document is designed to trick users into clicking on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://xajibur.ru/strik?utm_term=the+complete+book+of+questions+pdf PDF link annotation
    • http://pegejoruvufiron.sportsontheweb.net/biogas_plant_information.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/wheres_waldo_other_names.pdfIn PDF document text
    • https://vefubonipit.weebly.com/uploads/1/3/4/7/134719522/nikusibovu.pdfIn PDF document text
    • https://cdn.sqhk.co/vijamabaf/Es1Nhb8/segment_addition_postulate_worksheet_answer_key.pdfIn PDF document text
    • https://jotesufuxave.weebly.com/uploads/1/3/1/4/131483421/39ab05fe2d457.pdfIn PDF document text
    • http://maxoranano.sportsontheweb.net/orthographic_projection_sectional_view.pdfIn PDF document text
    • http://vorakumezaxof.mygamesonline.org/mezatuxudidavoku.pdfIn PDF document text
    • https://dikugero.weebly.com/uploads/1/3/4/3/134356342/239ef3.pdfIn PDF document text
    • https://toviladul.weebly.com/uploads/1/3/0/7/130776498/rebumok.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/qchgMOi/superhero_pixel_art_apk.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/interaction_between_biotic_and_abiotic_factors_in_an_ecosystem.pdfIn PDF document text
    • http://wedasuf.getenjoyment.net/three_questions_by_leo_tolstoy_summary_in_hindi.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/8ef12d14-ee4a-4667-a2ca-fe41a788d7a6/philips_respironics_simplygo_portable_oxygen_concentrator_price_in_india.pdfIn PDF document text
    • http://fewuxujijafefif.epizy.com/algorithms_design_techniques_and_analysis_alsuwaiyel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47bf37fe-3ce7-4e3c-915d-3d5b25823bb9/mopogez.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/pride_and_prejudice_full_movie_2005_putlockers.pdfIn PDF document text
    • http://xakazasaravi.onlinewebshop.net/sample_character_reference_letter_for_court_dui.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa06498f-c5a1-4161-bab6-b0b232454b44/winemogoxaka.pdfIn PDF document text
    • http://wonenuw.epizy.com/vazojezokipusuxafa.pdfIn PDF document text
    • http://fexagoxira.rf.gd/annie_jr_musical_cast_list.pdfIn PDF document text
    • http://jeranaxerobapil.rf.gd/steel_column_design_calculation.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_off0000f88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88E 5368 bytes
SHA-256: 60cbb1fa01571edc6891f5aec3dc951459c426a77b3b01ca3dc8b20708011e41
font_01_sfnt_off00010aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA7 11196 bytes
SHA-256: 4cc89f63e7176a519d88705ccd7d3a345e994b8c350a44b5f1dde3a98a76ce8e

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