Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f40d5350a4f8c7…

MALICIOUS

PDF

88.3 KB Created: 2021-09-15 10:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: beb4db9607d73d9b49e6f4573923db18 SHA-1: c947832ccd81cf935a6cdaf3037315b64b72f63c SHA-256: 49f40d5350a4f8c746de0700982822bc05224e0f164558c2354ade8472873b18
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The PDF structure and the presence of JavaScript point towards an attempt to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+walking+dead+world+beyond+1x05PDF 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_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 18384 bytes
SHA-256: d920240f9b5e497b16edc493e759699a501d70d15b938477ebef1ebee09feb4b
font_02_sfnt_off000139fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139FB 11064 bytes
SHA-256: e07b9cd08252c65b02057485120e3ad6da660dbcae617f29f840ea37c0ef729c