Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e99b72f62f03380…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 00:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f4b06bd9c68027320403c38ed4652077 SHA-1: 04e7c198575b2f5b46ec2b004a4b2ad8fc25ef6e SHA-256: 8e99b72f62f0338022b955441affb6900c597a9f0fec2527606fd964592af34a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The presence of numerous external URIs, including one pointing to a link farm, suggests an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://herfon-machinery.com/images/ckfinder/files/20210914172644.pdf In PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/kuniwudobufofejijum.pdfIn PDF document text
    • https://asi-filter.pl/files/file/64525042276.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/81610401416.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///jojenedujuvixu.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210902130159.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/lolom.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/99438045658.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/76739645968.pdfIn PDF document text
    • https://wittnebel.dk/file/33751674701.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/58806481078.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/47648362440.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/2381564792.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a83056d44---22601857995.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/178958362.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/5355522596.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/68404227034.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/bukifesunoxudutut.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/lakexemun.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac56399c5ab170f97364d2e62cfa81c8/vugabanuxowovovabopabox.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/sarimezej.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/netubedonedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=adobe+pdf+free+download+for+androidPDF 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_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 10432 bytes
SHA-256: 39bd1c3f57e44e92614027a9f52a77f3e4ecff198f30582ff3302830e61aefac
font_02_sfnt_off00010992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10992 17972 bytes
SHA-256: 5239a93adc68566f1edcd102dd6861db593f46e2739931ce1eb5866f7b939cd5

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