Malicious PDF — malware analysis report

Static analysis result for SHA-256 240d3613764ef7e1…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 19:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4357ba20b05c59c9797ee23480fe2634 SHA-1: 880477c503d387d4d510a5f832f1d06410020f95 SHA-256: 240d3613764ef7e1c0741c22c439e3948460bf968fc9c2074207d7bd32c10e41
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 within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to external URLs, as suggested by the PDF_URI heuristic, which are often used for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://awarelaxcentrum.cz/user_files/file/selenuveporuwed.pdf In PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/jasanotowusalutumi.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/fefuxiva.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/tiwijabafaluzop.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/48475062546.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/tekobovonokejov.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/dipetalodivoxedu.pdfIn PDF document text
    • http://donghotam.com/luutru/files/82229533050.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/selaluvuvaludarufet.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/gavipidojosamogibobavowe.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/82255455154.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/29013098934.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/58616256333.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/51481603032.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/bagixiwadobixisedum.pdfIn PDF document text
    • https://curvy.tw/upload/files/suvaxex.pdfIn PDF document text
    • http://anninh247.info/upload/files/51875855527.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/mulalobal.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b18e8616f3---bonisemuwu.pdfIn PDF document text
    • http://vtaky.sk/media/file/fatuwalirutiwupip.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/kapibixidedavabesevotako.pdfIn PDF document text
    • http://timocomputer.cz/files/file/5400616724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+vpn+apk+androidPDF 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_off0000d3cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CD 10232 bytes
SHA-256: 0523c29803d27712a0caa1cff7110e5a513bf6905686a9cd9d71291928157f14
font_01_sfnt_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 17152 bytes
SHA-256: 37cf58693bc26ba2a0ec58751fb120cda15ecdfee34ff0a9d666d8651180ca36
font_02_sfnt_off000116a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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