Malicious PDF — malware analysis report

Static analysis result for SHA-256 c686e89ecd0c1a80…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 11:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1e4e90d845b761eb76f1385b287608a2 SHA-1: 90866535e92dd8cadb9e6dbe35ce60b06658b78a SHA-256: c686e89ecd0c1a80f13327c61cd28013f2dabc2d3c9bc66f7bfaf1a94b679f96
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic firings indicate the presence of external URIs and a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to URLs such as https://inwebjor.ru/uplcv?utm_term=retrieve+deleted+photos+motorola+android+phone.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=retrieve+deleted+photos+motorola+android+phone PDF link annotation
    • http://langmoon.jp/js/upload/files/84342471520.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/94668811600.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/12957169710.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/3838394362.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/bilujepezajopazupa.pdfIn PDF document text
    • https://basisangka.com/contents/files/zubixojowezigimuguxenaxa.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/duvovesigarimutovisifil.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/32611770241.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/kegapumaw.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/38134024682.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/dujomosomukemalidepunaki.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/36484406656.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/verusevifakakox.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/lusezasejalenoleni.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/kufega.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/ziwisu.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/watofemawetuz.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/gusivosugorinos.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/petuzinunobejusonotat.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/26421699090.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/jixet.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/73353996696.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_off0000b0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FE 16532 bytes
SHA-256: a94fd10f360b6cdf457f9ff720c94eb9dbb2d23b1f08ea8c3bd71df4fcbc18cb
font_01_sfnt_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 10768 bytes
SHA-256: 96081b15be66a30e2f2ff23c51b679491efdaafd89b6fec044aa76b8d9e8ca5c

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