Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91aa55c469862f1…

MALICIOUS

PDF

65.1 KB Created: 2021-03-20 18:32:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 18ba45ab7b87a6eb52aaf16ab04b3446 SHA-1: 71b80d05ad0dd4dd6f59c58a0f5e8cd3aa211005 SHA-256: b91aa55c469862f1bb30af6959893f48d322394314fac9fd5d7f284fce0aa4d7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.8125

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 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://bologen.ru/award?keyword=articles+in+german+pdf PDF link annotation
    • http://padlamadla.site/alphabet_matching_with_pictures_worksheetvfm0h.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/067a467a0de4.pdfIn PDF document text
    • https://takazomidiki.weebly.com/uploads/1/3/4/4/134470224/rodumijalez_soguno_kituberal.pdfIn PDF document text
    • https://wivovisewisapu.weebly.com/uploads/1/3/5/9/135963584/bezoran-bosijive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452382/normal_5fedfafbdb928.pdfIn PDF document text
    • http://munupesifak.22web.org/viwalinalonifu.pdfIn PDF document text
    • http://vabetovopux.66ghz.com/best_free_movies_sites_for_mobile.pdfIn PDF document text
    • https://dokakuzod.weebly.com/uploads/1/3/4/8/134884054/nameje.pdfIn PDF document text
    • http://stroiline74.ru/how_to_listen_to_music_offline_on_soundcloud_for_freebsdx7.pdfIn PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/gitexaveno-wijovujozer.pdfIn PDF document text
    • http://smartcoin.design/most_common_english_phrases_used_in_daily_lifeu3r67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484126/normal_603a4bc243444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384468/normal_60186841116fc.pdfIn PDF document text
    • http://zevixoleg.iblogger.org/27872085759.pdfIn PDF document text
    • https://sivasanetit.weebly.com/uploads/1/3/6/0/136095735/xoron_fuxal_xedofidopedeku.pdfIn PDF document text
    • http://zavuwoxek.22web.org/descriptive_research_thesis.pdfIn PDF document text
    • http://jebewif.22web.org/tarakawu.pdfIn PDF document text
    • http://stakingyfi.com/9583328852273rz4.pdfIn PDF document text
    • http://ketotreno.buzz/36433652262j8fyh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vimeniwofeb.rf.gd/22448801518.pdfIn PDF document text
    • http://buzabob.epizy.com/livro_boca_do_inferno_download.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 5464 bytes
SHA-256: 02db43e6d2f14459050a64e79325564d7bcf21349853ad06167f44a12649ca9b

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