Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b992eb7208723d…

MALICIOUS

PDF

83.4 KB Created: 2021-10-06 00:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a5c8383aaa14814561ce3e652e1d354 SHA-1: 5e82b499142e0dad506fe25571d1dd4f92816c41 SHA-256: f9b992eb7208723de719623f652f1a00bfa1704584dd56029c889af3fc606f0e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many pointing to disposable domains and link farms, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=verse+light+in+the+darkness PDF link annotation
    • http://www.ez4parcel.net/upfile/files/2021/09/23/dopigexibowininazimafajug.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/489838883.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/kufevowuwuz.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/sanegesufarexib.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/83404392788.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/46150745221.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/xugore.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/bipejunanapetoninokabu.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/92914488354.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/41806154462.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/gorilopa.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/dulalidatavavomubopibi.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/93831773724.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3e224f2171fa9dffba07a1503665d1c3/94500406911.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rifonerufotuse.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/dirimu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/jelujatixap.pdfIn PDF document text
    • https://flomogroup.com/upload/files/suduzujiluk.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/87803458618.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/16269846509.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/67093365566.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/79734154657.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/dewaledekubivotaburitumi.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/gegewuzawaxak.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_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 10468 bytes
SHA-256: b6790db1adb55b437ee0f0c1746d7ecc657951738d2875263b97c9856c69d4bf
font_01_sfnt_off0000f83c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83C 18472 bytes
SHA-256: 8e7dca4e9db6df663783c8da91124a6747d8d08571f8a3a49485a74938e5b2c3
font_02_sfnt_off00012790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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