Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ce9cef903fbdb8…

MALICIOUS

PDF

71.7 KB Created: 2021-01-24 22:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ab1781195e3159b8dd7463f7328adcb9 SHA-1: d5b922a2806b6affeba17a124e784fdfcefdb60f SHA-256: 66ce9cef903fbdb880f64fc0594dc6452d00dba0b9778372350e2f24fd078ffa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

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://trafftec.ru/123?utm_term=m101+limited+stops PDF link annotation
    • http://dupomixu.iblogger.org/gomakaripikaleso.pdfIn PDF document text
    • https://zuwejuropuri.weebly.com/uploads/1/3/1/6/131606208/828590e8132b.pdfIn PDF document text
    • http://gakmancreatures.ru/63009579324p2ox3.pdfIn PDF document text
    • http://organicnu.info/warzone_2100_best_modsagbj7.pdfIn PDF document text
    • http://wugulisagu.iblogger.org/wallpapers_hd_4k_android.pdfIn PDF document text
    • http://getbuiss.online/mega_man_3_mobilea3skb.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/gmfJTgg/who_won_presidential_debate_2020_fox.pdfIn PDF document text
    • http://fexuvukenix.22web.org/bsc_3rd_year_maths_books.pdfIn PDF document text
    • https://kuxaxamolexude.weebly.com/uploads/1/3/4/8/134869233/3061003.pdfIn PDF document text
    • http://puwonasomoso.22web.org/92329771553.pdfIn PDF document text
    • http://kyponnik.online/zig_zag_run_length_coding_exampleeo1p0.pdfIn PDF document text
    • http://abwaab.su/mini_cardboard_cutouts_custom4m8a2.pdfIn PDF document text
    • https://nobawevedidilut.weebly.com/uploads/1/3/1/3/131379382/lesapudemitu_jonagegixadige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dojeranorered.epizy.com/72980492843.pdfIn PDF document text
    • http://suvumudupese.epizy.com/28917461918.pdfIn PDF document text
    • http://roxutudutupit.epizy.com/project_activity_log_template_excel.pdfIn PDF document text
    • http://vufufule.epizy.com/53160226313.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_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 4996 bytes
SHA-256: 3de089fc564b4693f33bfedf42e12dcbaaf74d5bdbcea244f3018b260fd4ead9
font_01_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 10968 bytes
SHA-256: 071eb8b4625289537c6cfbef324a0414164e7602b7a6bd24212bae85835967a1

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