Malicious PDF — malware analysis report

Static analysis result for SHA-256 61615e6af02bd2c7…

MALICIOUS

PDF

68.0 KB Created: 2021-06-09 14:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e777527ce232b997108d0717bc3688bb SHA-1: 0c14a0e2b00b3a6122e7e5c6cdfefb6922a5058b SHA-256: 61615e6af02bd2c789dc076cfd3eb3b765530a0513b54b0fdea55bd2f4c75f0f
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a mass of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or scam purposes. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://medvor.ru/pbw?utm_term=instagram+booster+followers+apk PDF link annotation
    • https://demewegib.weebly.com/uploads/1/3/4/8/134867988/e22716c015e.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/b5a7f347c14.pdfIn PDF document text
    • https://diwekivoveludu.weebly.com/uploads/1/3/5/3/135313391/4031212.pdfIn PDF document text
    • https://revekabidumuki.weebly.com/uploads/1/3/2/7/132710675/6991136.pdfIn PDF document text
    • https://dosabaret.weebly.com/uploads/1/3/4/8/134861273/4206651.pdfIn PDF document text
    • https://serabonileraso.weebly.com/uploads/1/3/4/4/134444783/bojan.pdfIn PDF document text
    • https://gofabede.weebly.com/uploads/1/3/1/4/131453232/7952560.pdfIn PDF document text
    • https://riwubabefos.weebly.com/uploads/1/3/4/5/134591520/2975925.pdfIn PDF document text
    • https://rafexalubez.weebly.com/uploads/1/3/4/3/134311016/158f879.pdfIn PDF document text
    • https://jafowunasakubiv.weebly.com/uploads/1/3/1/4/131437393/tiwizetimide_nurukotas_nagojezovo_rijopabir.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/susuvubenelipuxiwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luwapoveduvi.pbworks.com/w/file/fetch/144660645/personal_cash_flow_projection_excel_template.pdfIn PDF document text
    • http://lorugaz.pbworks.com/w/file/fetch/144655332/xujafonefasawovubewibo.pdfIn PDF document text
    • http://jozeluwofe.pbworks.com/f/vimuxakuxilotode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bc8accb-4c16-431c-b275-24ecc5ab0f32/runorepekesuvawosakedade.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/totakukizeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c56b9fd5-2056-422a-ae8a-714016ca84b2/lixofewozexodemosaroxu.pdfIn PDF document text
    • http://vananizi.pbworks.com/w/file/fetch/144504654/how_to_shuffle_tarot_cards_reversed.pdfIn 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_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 5452 bytes
SHA-256: 7c8c71854c09a305d05a6c2af4201948ce1262adbad2940fba812b45158c35dc
font_01_sfnt_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 10756 bytes
SHA-256: 896908d6e84a72064d4216672f8c88e568effb690954ee1348be181ea56981eb

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