Malicious PDF — malware analysis report

Static analysis result for SHA-256 5490456340e99bdf…

MALICIOUS

PDF

78.5 KB Created: 2021-03-29 14:39:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0402fdde88f3c2dd6d89df8655854b31 SHA-1: 3805ead7a17e20d1e39449822413caba9811e90e SHA-256: 5490456340e99bdfd7d9b6fe65b73bf1721acad2d023e31f007c96ca124244d5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the document's primary purpose is to drive traffic to these sites for malicious purposes.

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 http://batmbatm.ru/raymarine_e120_for_sale_ukpb6bo.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4467278/normal_605042bd8d217.pdfIn PDF document text
    • http://doweryklkq.space/google_drive_folder_fasterke1om.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463005/normal_603fa67575626.pdfIn PDF document text
    • http://mimowetoxizov.22web.org/72840653519.pdfIn PDF document text
    • http://babysampler.com/how_to_set_up_powerline_12002hl2i.pdfIn PDF document text
    • http://uaregroup.com/area_and_perimeter_worksheets_free2oici.pdfIn PDF document text
    • https://batusuxejodasav.weebly.com/uploads/1/3/1/8/131857782/6326544.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/rutumipati.pdfIn PDF document text
    • http://poopo.ru/98151804671ztmo6.pdfIn PDF document text
    • http://finansi-7.online/the_magician_tarot_significado86ovu.pdfIn PDF document text
    • http://povugufo.22web.org/sp_gupta_statistical_methods_download.pdfIn PDF document text
    • http://fortuneo.biz/mobodivt39b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dN4lCoxrs6M/wb?keyword=tal%20dorei%20campaign%20guide%20anyflipPDF link annotation
    • http://gozozofufeb.rf.gd/givukotijisarawop.pdfIn PDF document text
    • http://wegexaluda.epizy.com/pizudoxavofaket.pdfIn PDF document text
    • http://toxamifobofu.epizy.com/49594341835.pdfIn PDF document text
    • http://poramukuwulaji.epizy.com/mavokawomakep.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_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 5348 bytes
SHA-256: d0d89ca276c6e9ae411c6f508e33b6dacecf8c91a4629bde349cb179e95616a8
font_01_sfnt_off0001057e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 11036 bytes
SHA-256: 3e1f9c4b39534c7e33f59bf13473273ee03abd8a04fe94a3157e118a77ae5126

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