Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55895c5938c3675…

MALICIOUS

PDF

87.4 KB Created: 2021-09-22 13:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9452a88071a1959efc74611af6a20a88 SHA-1: d3c2fb394875eb9db341955e206502a60b0f18bc SHA-256: e55895c5938c3675c5af39b7d11ff4008a8fe29776b6c09c967286b71aefc1ab
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external links, many of which point to PDF files on various domains, indicating a potential link farm or redirection mechanism. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://presstone.hu/userfiles/file/fovazak.pdf In PDF document text
    • http://erictex.com/ufiles/files/58018443678.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/86131470166.pdfIn PDF document text
    • https://semut73.com/contents/files/zasonazivagubo.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/48810614521.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/jozepimifize.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210905005205_tmna5t.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109110323542239.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/45444890065.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/39478816699.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/55613487575.pdfIn PDF document text
    • http://storemisr.com/uploads/files/24740594135.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/25076737850.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135a8129627e---9911543686.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/10725904711.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/53840672355.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/gemivuxefixidufexi.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/24810041641.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-02/images/files/1370912865.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/juzodareruzuwejovuwojo.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/bidodobebeloporu.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/tumedop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=imei+changer+no+root+apkPDF 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_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 10652 bytes
SHA-256: 6d9ffcd615331fb4617e4acccddc35eb704008fa9e23fed106b8d92923b5cc68
font_01_sfnt_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 19436 bytes
SHA-256: 53fb9653d9383b71e77343060c4e6540817d2de09873d95cce8a1a3d8aa9f39f
font_02_sfnt_off00013882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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