Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2cde55fb16d8f35…

MALICIOUS

PDF

99.1 KB Created: 2021-09-14 04:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04f6823b38519e24012a1bd5383bd009 SHA-1: 054e47ec9f286af755e88ac9687c20afbbb4375f SHA-256: e2cde55fb16d8f35e53184553df4c0d4412012c070639aa569348f190b325d0b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The ML classifier also strongly indicates maliciousness. The presence of many external links suggests a phishing or redirection attempt, likely to deliver a secondary payload or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gruppopolidori.com/upload/image/file/vowivomu.pdf
    • http://dydlhx.com/upfiles/file///27149716027.pdf
    • http://greenworx.eu/images/uploads/files/48749432631.pdf
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210902192446.pdf
    • http://roycraft.ca/userfiles/file/96025111277.pdf
    • http://klgd.spokoino.ru/i/upload/files/kelexi.pdf
    • https://bodegoncriollo.com/userfiles/file/rudutuwirawom.pdf
    • https://pristineleather.com/userfiles/file/sivonuro.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcf203c2c2---namisoxawuxer.pdf
    • http://patrick-vallot.com/upload/files/88146357388.pdf
    • http://spharma.ua/files/file/gubafakotavuxano.pdf
    • http://affectif.ro/data/Image/file/rigidiromizaw.pdf
    • https://adikkedua.com/contents/files/logovoxitane.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/eff341c6d1446fcd87301a622f4e3c77/sesamugaturexe.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363e2c7fa8e---mesufalew.pdf
    • http://xhzhengli.com/upload/bakivupeseb.pdf
    • https://kvizek.hu/ckfinder/userfiles/files/84126722471.pdf
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/91395094664.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/24220148031.pdf
    • https://seas2010.cienciaevida.pt/site/upload/file/voperozipetakopilorodaliz.pdf
    • http://bangdientunhk.com/upload/files/42388462045.pdf
    • http://infoegrafica.com/userfiles/files/68979642294.pdf
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/girogabi.pdf
    • http://rovitek.com/userfiles/file/3969111473.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=all+fortnite+ps+plus+skins
    • 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_off00011bda.bin
aa73d22e6bf5c38042677496a33887ce07eea44cc36186927ca171e409890799		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDA 10360 bytes
font_01_sfnt_off0001336d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1336D 16792 bytes
font_02_sfnt_off00014b7f.bin
116d5cd3fbb6106b73e3fe15e4fb47c333dc8b771fddf76bb3678389141000df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7F 19584 bytes

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