Malicious PDF — malware analysis report

Static analysis result for SHA-256 28052a170fc422b0…

MALICIOUS

PDF

75.5 KB Created: 2021-03-21 07:01:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6defae73cb1e7671afc623b1dfafce50 SHA-1: 9ed9df38fd20143d0d5f358fbd121c221ee5ad6b SHA-256: 28052a170fc422b06b1758596e57df3f85c7c41dab08c3f6c13f898670cf2082
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/strik?utm_term=how+to+use+a+brookstone+projector PDF link annotation
    • http://viewcreditscore.info/ap_biology_laboratory_5_cell_respiration_answer_keywjcsb.pdfIn PDF document text
    • https://wuxinuwizon.weebly.com/uploads/1/3/0/7/130776673/sadefugenozili-gafidip-sakekapisapi.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/9e84b.pdfIn PDF document text
    • http://onlinesos.tech/sofowirikoxorawub9uzib.pdfIn PDF document text
    • https://tokemenar.weebly.com/uploads/1/3/4/3/134337898/xujezatukozirekirabu.pdfIn PDF document text
    • http://gevazuvunurodum.22web.org/alcoro_pt.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/6696a36ac1a14.pdfIn PDF document text
    • https://mitenipup.weebly.com/uploads/1/3/4/3/134363071/xutimetagejuwu.pdfIn PDF document text
    • https://cdn.sqhk.co/wetewajaba/dAibhbN/zapoxevubex.pdfIn PDF document text
    • http://axecheat8.xyz/madulixasxxjo2.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/iSciCpS/sejafupowaligebov.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/6ff693d2-4192-4547-9143-fd34b475a7ed/jopopetaxilarejok.pdfIn PDF document text
    • http://ximitexus.epizy.com/85526019364.pdfIn PDF document text
    • http://jiporiri.rf.gd/michael_greenberg_advanced_engineering_mathematics_pearson_2nd_edition_1998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/094afb0b-da1e-495e-92ba-d395aec5be91/how_to_stop_sensor_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abf77fb1-4f23-4c70-8cf0-37ded39756d8/weber_grills_charcoal_small.pdfIn PDF document text
    • https://29bb9f0a-cb36-4278-8b1c-05d86a2267e4.filesusr.com/ugd/25e746_d061fcc3d2dd4a859bfbab49dc495860.pdf?index=trueIn PDF document text
    • http://pedojup.rf.gd/lucky_draw_template_poster.pdfIn PDF document text
    • http://saligirij.rf.gd/89261266763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38202579-1825-4ac7-832b-e80bad6dd525/how_long_does_it_take_to_become_a_vet_tech_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf513ef-9487-427d-8b10-5fa9568cca23/xejad.pdfIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_0e9af5410c6a466aa8224932497c43a1.pdf?index=trueIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_703e2aa28cf1447e9948173cc4bf4a4b.pdf?index=trueIn 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_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 5228 bytes
SHA-256: e72b68b6bcfe3f7b26bd6390dd8d9b04cf489c0ec1cd6fa4a7bf9412ff5f582d
font_01_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 10952 bytes
SHA-256: 5f086eb36b83bf9ccf2ab3d1500dadac16adb401d991fbca58b8325e6894ea80

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