Malicious PDF — malware analysis report

Static analysis result for SHA-256 664890fc077e8ee5…

MALICIOUS

PDF

75.9 KB Created: 2021-10-01 08:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0d58f2344027b75b3b02880c286dfba6 SHA-1: 68192d3633b481adbff7ca2fbeaa23caf4709f5c SHA-256: 664890fc077e8ee5040c27602dd36abc9275370722da4e068bd254723ad126c0
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. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs found in the document, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/napokir.pdf In PDF document text
    • https://mosconi.net/userfiles/file/49662358221.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93393254673.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/zinabagizabalap.pdfIn PDF document text
    • http://sjhtractor.com/d/files/71253840174.pdfIn PDF document text
    • https://iohrp.org/f_files/files/10917421300.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/23115182309.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/8250639b776a7b87982572cd9c78d430/bajidid.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/mukebap.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/femizofuzopave.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/safagubosavofekojinatojof.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/totoredutawaraximu.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/415216242.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/4097026873.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/52825520586.pdfIn PDF document text
    • http://darec.sk/files/files/kivajudovidozalatitagusa.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/31010597715.pdfIn PDF document text
    • http://www.bash.cl/media/file/87948956917.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/7873461655.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/vazaxixedinupobamive.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/nefomimenetuzuwu.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/24171725328.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/3995994315.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/16019305555.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8ff05a64d20524c430b4a8bf5278eee/kuxuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+android+app+for+food+photographyPDF 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_off0000bebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 18516 bytes
SHA-256: bf07dcfdb8dd98d0f42ffc57b9540c99f54e6d3345dead0a0058cf2399c1b462
font_02_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 10896 bytes
SHA-256: 87e5574389589ec89784252a1d962e1568be25767031921b7244e331521cc148