Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed5a31f8c55fe6d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-19 00:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2307d84f9f473374d108d704b148a62 SHA-1: af50d909ef285059eb614a881eaaeef7c5c679ec SHA-256: 2ed5a31f8c55fe6d2b0e181ff5818b7053aa6de1d9945423410bc0cd715568b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate external URI redirection and a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=how+to+use+your+own+live+wallpaper PDF link annotation
    • http://tg-focus.ru/userfiles/files/nezekibarorolibilinubaj.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/mexepowisidu.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/74898091822.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/38587430455.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/27411123487.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/73805194147.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/56095204739.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382605921ad---degebaborewopiwuvut.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/70840631615.pdfIn PDF document text
    • http://jljemc.com/upload/files/papopidoje.pdfIn PDF document text
    • http://rs-entp.com/upload/file/nagitifi.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/palowadowumufo.pdfIn PDF document text
    • https://qkon.ca/images/file/31079318349.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/xexosaneg.pdfIn PDF document text
    • http://salt17.com/userfiles/files/20617121563.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/topubewalabisapowur.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/sewavevak.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/woxajotinuxolasoxitus.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/36118287824.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/wazezujevegu.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://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_off0000c403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC403 10600 bytes
SHA-256: 8b3c16d853ea0042c4d4f94f764a2137784b43ae315df1da4154762236f29403
font_01_sfnt_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 16956 bytes
SHA-256: 2ea59953c969f36db9e62c911c5cb4a699b88089d6e88b7712328155d17e1c1d

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