Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4de19764ddb4546…

MALICIOUS

PDF

69.6 KB Created: 2021-02-19 14:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d0e959b04c69178ff82c41be82a848ed SHA-1: 446926007774ea95f5401803212eda1bcfa85734 SHA-256: a4de19764ddb45465f509213d080e0a7ec9ffc62f34397d5350444c3488c9a5b
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which appear to be disposable or used for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of embedded URLs and the link farm heuristic suggest the document's primary purpose is to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://seumenha.ru/strik?utm_term=used+dixie+chopper+for+sale+in+louisiana PDF link annotation
    • https://rinuvimasajef.weebly.com/uploads/1/3/2/6/132695862/2e3d5d78757f94.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/bhhjijb/2927356065.pdfIn PDF document text
    • https://cdn.sqhk.co/kofatuziwu/bhekbgi/surface_cleaner_for_gas_pressure_washer_lowes.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/PrRbhcM/color_coded_chart_for_covid-_19.pdfIn PDF document text
    • http://shopmzm.site/ajay_atul_songs_video9e3re.pdfIn PDF document text
    • https://natuxebifenukud.weebly.com/uploads/1/3/1/3/131378868/4c05d87c9.pdfIn PDF document text
    • http://cafechorsu.ru/seroquel_medication_guideflrn8.pdfIn PDF document text
    • https://sojujigun.weebly.com/uploads/1/3/0/9/130969910/porixudajobepok.pdfIn PDF document text
    • https://tazusovekofuwaj.weebly.com/uploads/1/3/5/9/135969448/vopawitozumaxirexigu.pdfIn PDF document text
    • http://hookup153.site/tintin_books_in_bengaliknk16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489853/normal_5fe386419a397.pdfIn PDF document text
    • https://xetudutadoboja.weebly.com/uploads/1/3/4/3/134344850/8169397.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/gffH8IW/55762278819.pdfIn PDF document text
    • http://salestore.pro/what_should_you_do_if_nobody_will_sing_with_you_worksheet_answer_keyxx6de.pdfIn PDF document text
    • https://gamubojuteno.weebly.com/uploads/1/3/5/2/135299935/4362180.pdfIn PDF document text
    • http://usersonlineguardingsettings.site/lagu_bts_airplane_ilkpop._net0mq9r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418755/normal_5fd181de45238.pdfIn PDF document text
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/5809b1854d61d9.pdfIn PDF document text
    • http://lovechat24.club/xuxalanozivuroliy5wq6.pdfIn PDF document text
    • http://zesamoa.online/fikasutejojugebojiz9dfgn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420761/normal_6018607eb68e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D8 5304 bytes
SHA-256: 49a4955a2c130f25f36fa4e033fb1f5647dae749f9d0fe95ed59dde9cc394e84
font_01_sfnt_off0000e3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E4 10788 bytes
SHA-256: 3d7b329b8af7e2e22bf2d2b7b21e300e5b883134ea8326cb379dd13211ff907c