Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8c610b023c1b8f…

MALICIOUS

PDF

68.6 KB Created: 2021-02-26 17:42:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 385f7e98eda28a1302a6319359ecb3e0 SHA-1: 53187f81e5a3ca937571e947cf7a3240810ff929 SHA-256: df8c610b023c1b8f6d6dc1483b0a508f3c68fad416a4c0530b0cb0d49b6df731
126 Risk Score

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 0.9998

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://leonvi.ru/123?utm_term=tajweed+rules+pdf+english PDF link annotation
    • http://vitalia-transports.com/79330709977sar53.pdfIn PDF document text
    • http://thehensleys.org/gininifasesavagode3mqtv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_602ca0de1a20f.pdfIn PDF document text
    • http://olivamebel.com/kamanenosejoxulezodat6w8uf.pdfIn PDF document text
    • http://lifolibi.sportsontheweb.net/what_machines_to_use_at_planet_fitness_for_abs.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/sigusukusewabalukodew.pdfIn PDF document text
    • http://lastmarkt.ru/st_ve_deterjan_deneyi3gwl0.pdfIn PDF document text
    • http://silver35.ru/ashrae_psychrometric_chart_free45i4j.pdfIn PDF document text
    • http://forecast.bet/bedadewh496v.pdfIn PDF document text
    • http://mazafaka69pussy.online/shanta_bai_song_ringtone_freeepvq7.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/bissell_big_green_professional_carpet_cleaner_machine_rental.pdfIn PDF document text
    • http://marinarus.space/broca_para_machuelov51bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://galojuxutiwas.epizy.com/dozuvuxadawomawatip.pdfIn PDF document text
    • http://betemeparax.rf.gd/64842372692.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_off0000cfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE2 5420 bytes
SHA-256: d8114e970a6f7257e5528ac97e6f9dababd9f13fa230c1ca776af8e593b23755
font_01_sfnt_off0000e260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE260 10288 bytes
SHA-256: cd47ae645f721efb63913afa7de3a2c0f3887cd57f0677c2b940185793081bbc