Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6b99b679e50349…

MALICIOUS

PDF

73.9 KB Created: 2021-09-19 15:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4774067f89b195e581f1d5d16af4aa2 SHA-1: 7b7314df6066353896d2b97fdcc4e69f7f986401 SHA-256: 8e6b99b679e503491ab041e24ae1d8453ed32abf81e82d6d21e2bea320b82520
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers. The PDF also contains numerous external URIs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://reklamaopole.pl/userfiles/file/50388318262.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/64481193061.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210911_EFE704FB9D8F3DDF.pdf
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/18449881413.pdf
    • http://cbstav.cz/file/24536116190.pdf
    • https://koratspring.com/upload/file/zapovemimexukezununo.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392120d1690---fipojujabur.pdf
    • https://xn--80aesyq.xn--p1ai/files/file/21053865621.pdf
    • http://yokosohk.com/files/fckfiles/file/47761039077.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303669e1165---88677232313.pdf
    • http://mc-opony.pl/files/file/64756053234.pdf
    • https://foodsafebox.com/ckfinder/userfiles/files/kujadikagupiwezumu.pdf
    • https://perfectsextherapy.com/public_html/userfiles/file/26645497891.pdf
    • https://listocrm.com/userfiles/files/89118563650.pdf
    • http://librojuridico.com/aym_images/files/62909160546.pdf
    • http://silarperu.com/UserFiles/file/76016934278.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/81703829980.pdf
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/metobuzedosifinowatin.pdf
    • http://gold-carsales.com/js/upload/files/maretiputexasejikajag.pdf
    • http://thrifty-uy.com/files/others/77388789942.pdf
    • https://nikosdimos.gr/userfiles/file/16060859449.pdf
    • http://hongpakthai.com/ckfinder/userfiles/files/7196773010.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=libro+las+48+leyes+del+poder+pdf
    • 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_off0000ba70.bin
8663e4df07a150fe695a49cad71d145902b755e0f551fc27021ab54f3d206e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA70 18116 bytes
font_01_sfnt_off0000e8cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 16792 bytes
font_02_sfnt_off000100e3.bin
838e255b6ac38a612929a428b9b7640f4cc254a40d60dc83ad922adc9584c632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 10784 bytes

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