Malicious PDF — malware analysis report

Static analysis result for SHA-256 4201538e4d371a05…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 14:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: bebc58c8da8699bcbe68dda47f69cb13 SHA-1: 603a88ad2adfc21e9094d2a1dbc8b6ac158c59be SHA-256: 4201538e4d371a05a4139feec23102fe8ce61af66a7f6d904fd480008a816f9e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=teleport+photo+editor+app PDF link annotation
    • http://voyagevietnamlaos.com/hinhanh/file/zugakizobeborikumefezer.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d00d593f1---72235859807.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/fasox.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/puretoxosipizukopazo.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/masevokarinefudekuniwiz.pdfIn PDF document text
    • https://tivicom.vn/upload/files/mifudasik.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/zasomevat.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/50595509716.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/xilabazet.pdfIn PDF document text
    • http://ingatlanfelugyelet.hu/uploads/file/lawuxadipo.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/90991865882.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/61832230461.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/winadixivero.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/16709231152.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/xawupogazefore.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/kinireluzizopilesobogagek.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210905232733.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/libojetupujero.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/nunorofedezajal.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/tobeju.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/vulonigadejoraj.pdfIn PDF document text
    • https://rjpexport.com/files/pawopamizop.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/87889220810.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/selubasibukuparoduzema.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5af5a0434bf7314d14ce5573577ff440/diwuxipakiromalore.pdfIn PDF document text
    • 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_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 18272 bytes
SHA-256: 6aba37ee8a254e293f96a14650a5a5b3456501f3e05c370705124410b397eeb8
font_01_sfnt_off0001065d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E74 10180 bytes
SHA-256: f86f19772fd9a4ad2cd59922fa0e870b748b57f9774282e0fff0668b38870528