Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dba171d929c452d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 11:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 39f1ee27e70bdfb3d8f02e3fef92d494 SHA-1: c10754a41e814cef529c51ef108333c1fcec1a1b SHA-256: 2dba171d929c452d8ee01fe1d8cd6c87cfdef4166b3da8d993442b020785e4a1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, likely intended to obscure the final destination and evade detection. ClamAV and ML classifiers flagged this PDF as malicious, indicating a high likelihood of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/39894164999.pdf In PDF document text
    • http://georgekoldun.com/var/upload/file/lapexon.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/3622886743.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/16127249543.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/livuvebupula.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210905_065229.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/204886279.pdfIn PDF document text
    • http://hulstcustoms.ru/uploads/files/28311867928.pdfIn PDF document text
    • http://telektrans.hu/editor_up/32113331855.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/42971273654.pdfIn PDF document text
    • https://kimcert.org/E/file/zajereje.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/zopaxubazejegojuta.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/sevijogugipenoxagur.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/50495078638.pdfIn PDF document text
    • http://sns.hu/_user/file/74705782906.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630737818.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138911d067ec---voral.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139696d8fe7c---47241488925.pdfIn PDF document text
    • http://hla.vn/upload/files/74921712094.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/37233764110.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/52178116832.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/rakevoguxabudipisovodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gta+mod+android+1PDF 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_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 10156 bytes
SHA-256: a44028b3e760a9c439039d32459b917d203bc9f5dedb44f5cdfc95c3c284dca9
font_01_sfnt_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 17532 bytes
SHA-256: f0e42d038d01a8a77d9fa9c16fce5f3e6ee2035208c313b4d99121e15725b375
font_02_sfnt_off00011ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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