Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f5fc2e69c60ca7…

MALICIOUS

PDF

76.7 KB Created: 2021-03-01 15:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0583d909f0c6e49b7bdba32a52b83505 SHA-1: e955698493fb7348297575cd198e97341e915dc1 SHA-256: 86f5fc2e69c60ca77ed8b76825c8f60c25fa48e9d36defe75261e891e7b61a51
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. While no scripts were extracted, the PDF structure and URL distribution suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=how+to+check+oxygen+level PDF link annotation
    • http://vipmanmarket.space/mr_peabody_and_sherman_full_movie_online_123moviesp9rc5.pdfIn PDF document text
    • http://omerkatanalp.com/latasewipv099w.pdfIn PDF document text
    • http://winovigamaj.mygamesonline.org/13483248690.pdfIn PDF document text
    • http://1fps.ru/949744892731gujl.pdfIn PDF document text
    • http://prizinsta24.online/latest_software_for_iphone_6_pluskl5c2.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/lg_vrf_error_code_ch_03.pdfIn PDF document text
    • http://roflan.site/36297425039w2q54.pdfIn PDF document text
    • http://reliables.ru/boxisosowol6yayi.pdfIn PDF document text
    • http://twitter-center.com/jologelijajuwatanur7835s.pdfIn PDF document text
    • https://pesuzipowezav.weebly.com/uploads/1/3/1/6/131636843/41154dcab.pdfIn PDF document text
    • https://togazozaxezux.weebly.com/uploads/1/3/1/6/131606461/xuvajetejen.pdfIn PDF document text
    • http://fullhp.info/how_to_cook_brown_rice_in_electric_pressure_cookern19ff.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/how_much_does_it_cost_to_fix_a_refrigerator_compressor.pdfIn PDF document text
    • http://alisaborodaenko.design/color_cars_games_monster_truck_coloring_sheetsn9ayr.pdfIn PDF document text
    • https://wiromokuxuzub.weebly.com/uploads/1/3/5/2/135298753/wegonaxovazafe-sukelolebolef.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/lurutopobi/android_os_watch.pdfIn PDF document text
    • http://lezujepadu.rf.gd/autobiography_of_benjamin_franklin_book.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/misal_romano_para_mexico.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/sevozusudafut.pdfIn PDF document text
    • http://jeragapa.epizy.com/28222344618.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/integrated_chinese_1_4th_edition_workbook_answers.pdfIn PDF document text
    • http://vaxokepa.rf.gd/spelling_connections_grade_3_answer_key.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_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 4924 bytes
SHA-256: dd5bc5c43f14f5573e98acc330a671c2811acf2eec45ac3ecb82591466d7cddc
font_01_sfnt_off00010142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 10532 bytes
SHA-256: 67dee2d30e8a45c6beccad5c9eda1d5726ea6ab7f6d8334d5db1bc80b3135a21

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