Malicious PDF — malware analysis report

Static analysis result for SHA-256 c732dfc41c0594c4…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 12:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4ad1f3408172ba7f5c24013e866e95ba SHA-1: 985cc197ceff74d91bbb4cc0b2b93c2fef3e8777 SHA-256: c732dfc41c0594c442af6ee854012e517eb928c744c2af2fe6f9d6251a63170d
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 disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on low-reputation domains, likely to obscure malicious intent. The ML classifier and ClamAV detection strongly suggest malicious content, likely a phishing or downloader attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nullemont.fr/nullemont/ckfinder/userfiles/files/43123909626.pdf In PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144a7e4e8f73---70655558407.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/31989131093.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/gadijexilake.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/131911197495.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/63528611377.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/44111493782.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141de8678b64---74879240078.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/53389856666.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/86006003643.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/jexisozapavo.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/20363826407.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/wolefiketozorepofedisuzu.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/zilawi.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/ridaganigoxatepubogolu.pdfIn PDF document text
    • https://blv.by/upload/editor/files/rubapix.pdfIn PDF document text
    • http://ghefootmassage.com/fckeditor_userfiles/file/geliveg.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/ridemufofefapev.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/jezerilowodulonab.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/41982422518.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/33645003724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+clash+royale+unlimited+moneyPDF 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_off0000ae6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC681 10936 bytes
SHA-256: f1feee4eff0facbce26a21e49b1d78d6647103e491cb3a05c5d0ffe5cef1bd32
font_02_sfnt_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 14736 bytes
SHA-256: 1e515a359b226f10b4c5781c22aef12e3bddb1fd7999a2e53e869028daa7ad8d