Malicious PDF — malware analysis report

Static analysis result for SHA-256 365408dd78a567be…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 16:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c9b7bdc008494a8683c8d044bc8f8bb6 SHA-1: bd797f9ccbbe6a7583d8cbeb94e1e300ea222a08 SHA-256: 365408dd78a567be0d04118c3ee909f832913f62c1feae0219bf4113f60f3372
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 part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the embedded links. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or perform malicious actions within the document context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/uplcv?utm_term=pubg+lite+apk+latest+version+download PDF link annotation
    • https://mamap.in/ci/userfiles/files/rilajo.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/49359543245.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/18210460846.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/89565190131.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/nebewubaxikewevuzodotoved.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/56252039875.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/lebefoxijo.pdfIn PDF document text
    • https://shibbirs.com/media/files/mesaxen.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/48517567128.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/sogoxofododugodexezuvumex.pdfIn PDF document text
    • http://prmakeup.com/Image/files/40634169673.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/gobibegalup.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/2649206405.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/33232241253.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613097c3a758a---7565262479.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/88075469700.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16142fb22db856---13207681888.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/suzasigaregibuwajimojufav.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/27645332042.pdfIn PDF document text
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/74400113520.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/zuzejorafuxidivobebane.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/mubajomipepazadojaje.pdfIn PDF document text
    • http://edeins.com/userfiles/file/kopivenenixubisenit.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_off0000d5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 17000 bytes
SHA-256: c9fe83b56a7f20643c9921b8c716cf869f38529b8d0279ffc5d2835ebe4d947c
font_02_sfnt_off000119be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 11052 bytes
SHA-256: f7b898a42bb973f6904b17959732aa10ad29bf6d5943a941f110be1eea29b46e

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