Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b24319b771e6c7b…

MALICIOUS

PDF

82.1 KB Created: 2021-02-17 00:48:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5dc2af6b07398ff719224cdd1b9bcf8c SHA-1: 648e97602322de8dc8893d21f4ce4216dd09e6a7 SHA-256: 5b24319b771e6c7ba31946c81b132a75384ea08a4a807c4c0518b6cdd4ca5ca4
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier also strongly indicated maliciousness. The presence of embedded URLs and the nature of the heuristics point towards a phishing or scam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/aws?utm_term=how+to+check+if+cosrx+product+is+real PDF link annotation
    • https://cdn.sqhk.co/nugopanage/kihhgNi/desert_racer_dallas_menu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406456/normal_5fe751c60de1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449992/normal_5ff38764b378f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493589/normal_6014f20757cd5.pdfIn PDF document text
    • https://cdn.sqhk.co/perikowep/3kWjg6u/hd_wallpapers_for_iphone_aesthetic.pdfIn PDF document text
    • https://wemodolitafuroj.weebly.com/uploads/1/3/6/0/136055174/xokedafurijebol.pdfIn PDF document text
    • http://vukabakoxipus.22web.org/a_guide_to_it_technical_support_9th_edition_free_download.pdfIn PDF document text
    • http://introdom.ru/android_store_data_in_phone_memoryf822t.pdfIn PDF document text
    • https://jabakatuni.weebly.com/uploads/1/3/1/0/131071057/1311076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fdac0e0b2219.pdfIn PDF document text
    • https://cdn.sqhk.co/reposivekow/hjfzgjj/symptoms_of_chikungunya_fever_in_child.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482188/normal_60034ce5c7646.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/hay1KRS/celcom_pulse_download.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/resisuna/xinarowozu.pdfIn PDF document text
    • http://dubabin.rf.gd/excel_vba_open_workbook_and_copy_sheet.pdfIn PDF document text
    • http://merizipu.rf.gd/diagnostico_de_salud_comunitario.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/dekefaruzu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 3488 bytes
SHA-256: 3c8d312bb695fd462b5b15b594ad387a4e6d0f93c6e7ccf3cceb91f93062e180
font_01_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 5428 bytes
SHA-256: a78d0d9ae7a23773cba129affaf4d7a601101e2b356f8910135724f175a1d8cc
font_02_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 16332 bytes
SHA-256: cfabe1516cd7e58711e149028a761937de36e9c18eddd0b67815654509da21a9

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