Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc6ade5659f9042…

MALICIOUS

PDF

73.9 KB Created: 2021-03-01 01:09:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 7cd24cad2999bdc77cb46e18bfd03f69 SHA-1: 3b658a240a951338135bde9ab5d5d420b639c83d SHA-256: cfc6ade5659f904241d69d1d577b53fa92fbe1573bdc5a1ab91bf976048180d3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely leading users to external 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://nipisod.ru/strik?utm_term=is+forex+still+profitable+in+2020 PDF link annotation
    • https://cdn.sqhk.co/soxuvezosapa/idjjdgx/ritolisobofakobopekafebo.pdfIn PDF document text
    • http://bachanalytics.com/47239462453s0lfk.pdfIn PDF document text
    • http://ru-payment.casa/oracle_database_client_installation_linux96ej6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_602e98874b891.pdfIn PDF document text
    • http://all-gopro.com/flow_free_apple_store4vxwv.pdfIn PDF document text
    • http://maporivibadiwaj.iblogger.org/arabic_chillout_music_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jinuzekovodi/AGhbheU/51870515456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_603c162070dc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463788/normal_5fdbcc50333dc.pdfIn PDF document text
    • http://rumagadoli.22web.org/xudivivepubodanidufege.pdfIn PDF document text
    • http://omynutural.space/the_appraisal_of_real_estatez8pux.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/xufoxorog/believer_audio_song_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/nene_ambani_telugu_movie_audio_songs.pdfIn PDF document text
    • http://zerozuru.epizy.com/92403407451.pdfIn PDF document text
    • http://megutid.epizy.com/answering_interview_questions_about_strengths_and_weaknesses.pdfIn PDF document text
    • http://delomubabobuzu.epizy.com/gillette_fusion_proglide_manual_razor_blades.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/free_homophones_worksheets_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/73156921976.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_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 5316 bytes
SHA-256: ed250e9baef6f24fab4dc11b02be1b18acf6fbcc38808470d4f344e5bea608b4
font_01_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 11128 bytes
SHA-256: 9d1f6d54a6acf5e4adc5874f82d76875b69e967f571a3b8b2f20581e95118077

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