Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f6538aa11262eb…

MALICIOUS

PDF

92.1 KB Created: 2021-09-16 12:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1daa7d541eca9eca9b09493bcfea79a3 SHA-1: 29123905e4f0a14a3af37ce55388e19b291ee9b2 SHA-256: 24f6538aa11262eb4718615e09adfc99f18168e8a1fef3ba53e701acb6b9558f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, 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 and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which point to a link farm on disposable hosting.

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://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/wadefitodobal.pdf
    • http://mirutte.com/newsfiles/files/vaden.pdf
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/45013175338.pdf
    • http://orthodoxvaidikasanghom.org/userfiles/file/23437812214.pdf
    • http://heninrealty.com/userfiles/files/sopuzupuluxarumumu.pdf
    • https://bokaichenyu.com/upload/files/xalisapi.pdf
    • https://tumsad.org/img/editor/image/file/gemadozufaxala.pdf
    • http://tw-tms.com/uploadpic/xw/files/72225512925.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/liratulosujeti.pdf
    • http://bimbrlata.cz/UserFiles/File/56666164881.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bccde03f3---bipafijukajokunor.pdf
    • https://aiaciran.org/cache/fck_files/file/32837140283.pdf
    • http://www.tractortools.cz/ckfinder/userfiles/files/34726142329.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/50358880725.pdf
    • https://carsen.sk/editor_uploads/system/files/fagewurozubo.pdf
    • http://www.dean-cpa.com/files/adminpic/file/6471794094.pdf
    • http://huarui-bio.com/upload/files/47207321523.pdf
    • http://haraj-alqunfudhah.com/userfiles/file/peviwakarosag.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/542c96ad02cc4173fe7d11621e6225a7/werojafedosibe.pdf
    • http://konikanarrowfab.com/ckfinder/userfiles/files/nijapoledawaludomel.pdf
    • http://studiocariola.com/userfiles/files/navepun.pdf
    • http://lifebeachvilla.com/uploads/image/files/32109035658.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=blockstarplanet+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001038b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 16792 bytes
font_01_sfnt_off00011ba2.bin
b4c7262bd2a075d2ec3952a0228ae7e992911d814a2bc41d6f551e862c5c0664		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA2 10728 bytes
font_02_sfnt_off00013459.bin
6a427bd1531945c1e40856fbfbf19860cc824948d0c88cf008f69720b8adf1d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13459 17908 bytes

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