Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe159672bdfa7f2e…

MALICIOUS

PDF

71.7 KB Created: 2021-10-04 04:30:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9524a0852a78b6b4d8fda77fa46c4f36 SHA-1: 7037c651631531b42d163ee949e51b2529d54ef0 SHA-256: fe159672bdfa7f2ece9143705dc613ca01b6e0e692ed7e4aecb45b69c92b051c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/55577f5dfa64df36b2f6734675b76689/33468415260.pdf In PDF document text
    • http://ducthanggroup.com/webroot/img/files/xukowuvimimulomuvenon.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/josovebafobin.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/worodakoje.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/63909750205.pdfIn PDF document text
    • http://okcashbagusa.com/uploads/files/tamufe.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/womekemapoxezazisiw.pdfIn PDF document text
    • https://btegypt.com/file/rufumemujafofuze.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/98833584223.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/68419333144.pdfIn PDF document text
    • http://adwokaci-pila.pl/userfiles/file/7606424739.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/dijunutozowe.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/40812333357.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/rogukosideponuk.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/lotakem.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/68310019421.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/49080019911.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/95487753803.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/25919732484.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/74653468698.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5n3nllemqu4qseh4g9dord9ro7/83543316941.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/34138861904.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/setenibo.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/babuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=real+steel+boxing+champions+apkPDF 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_off0000b3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DB 16844 bytes
SHA-256: ca4ac13cb0960f1fb1de0f7fd10bb6429b98c692c94d7cb64bc2c90ecc836354
font_01_sfnt_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 11100 bytes
SHA-256: c7dd70c4d49d21b45043bbb47d6987006740e00ac97fff15318f38c9597d8f09