Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cab8ea2937a081c…

MALICIOUS

PDF

70.5 KB Created: 2021-09-18 16:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f5aec191fc820caac6f5d3ffffaf69f SHA-1: ffd66babfa43fb710b33b65f98f1903296b81cce SHA-256: 5cab8ea2937a081c6462a9078b67432238de04c0b20cb0dfbe68c9978a0a4f4f
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to potentially disposable hosting, suggesting an attempt to distribute malicious content or phish for information. While no scripts were explicitly extracted, the nature of the PDF and the numerous embedded URLs point towards an attack pattern involving redirection to malicious sites, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://alpanelektrik.com/depo/sayfaresim/file/5171219727.pdf In PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac99f18cd1---somaxa.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/79713273108.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/numofagokox.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/13090026314.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/5302773792.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/24894259580.pdfIn PDF document text
    • http://scarpatti.com/files/60601864240.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/resopoxopifebiw.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3b2bc55e7---terisaviwenodop.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/gumegebawapevepepojuti.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/52425550995.pdfIn PDF document text
    • http://atrsara.ir/resource/files/87734770984.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/tubadidewapomalifaded.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/78119246130.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/gulakuletisa.pdfIn PDF document text
    • http://czyxchem.com/upload/files/88419509947.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/gaberope.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/11157462331.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/wotejefalaxerugoneniso.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/dezezigu.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/sumexetegotamabit.pdfIn PDF document text
    • http://xn--12cxa2boh7cd6g7anex5omh.com/ckfinder/images/files/kizimikaxokavunelol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=quadratic+function+with+maximum+valuePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDA 10988 bytes
SHA-256: be60adfa228dfea7a2bb9ba7cddb372ed0015eea99033a76b1220f5b45d8ba3a
font_01_sfnt_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 16652 bytes
SHA-256: da6ce465e187a7075a213286c632b331188bd968f4506e7d776054ac3908aecb
font_02_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.