Malicious PDF — malware analysis report

Static analysis result for SHA-256 62167fc9addcdb68…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 10:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa389c08743b3c167493cb7af42e5c08 SHA-1: 0275a64118fc873ba2aef5dc4659d1cea0fb743f SHA-256: 62167fc9addcdb688ade1a62944dc2c44f441e6bbd10e213f5d0adf461916425
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to unknown domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using many links on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://il-gusto.com/images/file/wepotepajibalavigon.pdf
    • http://coumert.com/images/file/40258316681.pdf
    • https://insinkerator.us/images/uploaded/file/febezomulujepiwixowo.pdf
    • https://maviet.vn/upload/files/zugab.pdf
    • https://blnk.eu/userfiles/files/movavewudelugib.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/xokak.pdf
    • http://sjhrz.com/images/upload/File/patasudemidanes.pdf
    • https://bunianco.com/other_files/File/konazisaxa.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/913571a2f2aceeddd6894e7a34697ce0/rotedetatikuxiwivari.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/31301525900.pdf
    • http://anipetkingdom.com/webroot/img/files/49721787062.pdf
    • http://vlajkylevne.cz/UserFiles/File/dovewav.pdf
    • http://knshzj.com/CKEdit/upload/files/19187401593.pdf
    • http://2rent.gr/userfiles/file/xobirosagale.pdf
    • http://erodiertechnik-wenzel.de/userfiles/file/zumukekizawafowaku.pdf
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/togokepokiriwud.pdf
    • http://mayjack.com/upload/files/80683749195.pdf
    • http://ttworld.hu/uploads/content_files/files/vexedunuzasesoxopafimu.pdf
    • http://wmc21.com/ckupload/files/tojunojo.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/1235122717.pdf
    • http://lerucherdesanges.fr/userfiles/file/sexujotedafegu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=subtitles+for+a+quiet+place
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab09.bin
ad1dbe14c7b1a7ef86e538990f44bfa3b1bfca28834ffca7bcba19325fa97d02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB09 10828 bytes
font_01_sfnt_off0000c3ed.bin
5f965858e36123c67f0f72dd8a3cb8e41b116e27af8b783e5d9260fd187b58a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3ED 15200 bytes
font_02_sfnt_off0000ea71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 16792 bytes

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