Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dcec5729492becc…

MALICIOUS

PDF

78.9 KB Created: 2021-05-01 11:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ad323234f3144c0c26c4c4314bcd899a SHA-1: 7ccd319c0c2887e9f7cc0df2dcafc40308003b47 SHA-256: 5dcec5729492beccdf3e0a07e88ab110261c0231581827df8a94d735d492ea18
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which are part of a link farm designed to obscure the final destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, suggesting the document is intended to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm structure strongly suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://leonvi.ru/strik?utm_term=life+application+bible+niv+version PDF link annotation
    • http://padapup.iblogger.org/zizoguvoraputulifiwolopor.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/eibihgR/vexem.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxixixixi/Uwjdwig/corporate_birthday_card_template_free.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/8549971.pdfIn PDF document text
    • http://lezofifividex.scienceontheweb.net/alfredo_bosi_reflexes_sobre_a_arte.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/zMgaijb/dasanora.pdfIn PDF document text
    • https://cdn.sqhk.co/tarolaser/jfgegef/cryptocurrency_exchange_platform_open_source.pdfIn PDF document text
    • https://vitukotegow.weebly.com/uploads/1/3/0/7/130775282/9818628.pdfIn PDF document text
    • http://vusejulene.iblogger.org/nujefawopot.pdfIn PDF document text
    • http://zovitidagawas.sportsontheweb.net/virtues_and_vices_aristotle.pdfIn PDF document text
    • https://xavilisepu.weebly.com/uploads/1/3/4/2/134235747/simepapimoj_togevumifujovud.pdfIn PDF document text
    • http://katipef.medianewsonline.com/cours_grammaire_anglais_gratuit.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/72b11f7f-da78-4a24-bd75-e52a94e63eb1/xuwoxinos.pdfIn PDF document text
    • http://tozegebefile.rf.gd/dna_replication_in_prokaryotes_notes.pdfIn PDF document text
    • http://jenizigigeno.epizy.com/asnt_level_2_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9bf759-778c-4c45-84e5-cf93181e7016/2010_chevy_camaro_ss_twin_turbo_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c89c0cba-7781-41bb-bb90-3233d19fb580/7022663821.pdfIn PDF document text
    • http://jabejanaboz.atwebpages.com/aneuploidia_e_euploidia.pdfIn PDF document text
    • http://pozidijapepore.atwebpages.com/nurubolozurin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4de653e-c086-428f-b047-bd00a8d67485/how_much_do_starbucks_baristas_get_paid_in_missouri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca6f910d-3b5a-4cf1-977b-ab1d128ded56/child_by_tiger_characters.pdfIn PDF document text
    • http://gixogofano.rf.gd/assam_up_tet_question_paper_2020_download.pdfIn PDF document text
    • http://titetirif.epizy.com/basic_dashboard_template_excel.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_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 5148 bytes
SHA-256: b7d186c85042770b7772b717afb98af00a336ed9dad0d573d2ea4c77ecfe0e1e
font_01_sfnt_off00010883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10883 10780 bytes
SHA-256: 81df55fc583b44315e3308c30083e7e44c91fd589dde26be4270e7a872251647