Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee23e84266fe816c…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 21:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b179cf3d4bc735c0d5ddc05ae5a2d0c SHA-1: fe3695b0d58ffd1c8a766ee27bc09aab220fc43e SHA-256: ee23e84266fe816c6d3b537f8914c07e2d37a49f6eb0066f54a9e46be89b9ee4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured to appear as file download links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of distinct, low-reputation links, suggesting a phishing or malware distribution campaign. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • 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.
  • 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://catamma.ru/uplcv?utm_term=file+commander+pro+apk
    • http://jnejendomsdrift.dk/userfiles/file/2489899888.pdf
    • https://ssvacancy.com/ckfinder/userfiles/files/wilozewo.pdf
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/kagavo.pdf
    • http://halanmilk.com/upload/files/tavapodadegebisijawo.pdf
    • http://giasudaihocsupham.com/Images_upload/files/49618576285.pdf
    • https://dom4m.lv/userfiles/files/mibovilegugarukolazizuma.pdf
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/84659252387.pdf
    • https://pixel.bg/img/file/17140228180.pdf
    • http://wonderpanel.com/app/webroot/img/file/7809903709.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614096687b02f---sidugetafojugifup.pdf
    • https://cebubigsellers.com/userfiles/file/94843800160.pdf
    • http://gamboeng.com/assets/ckfinder/userfiles/files/19411090339.pdf
    • http://vkts.se/userfiles/file/gavabojimorafa.pdf
    • http://vecsecity.info/editor_up/82290708969.pdf
    • http://tungalag.mn/userfiles/files/jerevijusojoxakinidoval.pdf
    • http://vpsystem.com/files/fck/87459674957.pdf
    • http://dogomanhnghia.com/uploads/files/womexidatitolefovuwadu.pdf
    • http://koryosushi.com/uploads/files/verolulizedi.pdf
    • http://pscworld.eu/ckfinder/userfiles/files/luleribuwejilutitibabeki.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/katujisevetogiworu.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/lotifejimifinovekurevib.pdf
    • http://grotech.in/userfiles/file/witebamu.pdf
    • https://mamotato.ro/userfiles/file/lemubimufepakuputuwejowut.pdf
    • http://anhuifan.com/upload_fck/file/2021-9-15/20210915165433353019.pdf
    • http://rem-proekt.com/f/file/mariro.pdf
    • http://yasairamenbar.com/uploads/files/5392025182.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_off0000c117.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC117 16792 bytes
font_01_sfnt_off0000d92e.bin
0ac56ed0e27923087bfc276bf778aa787c442fb846b1d3074f16a5b354986bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 10476 bytes
font_02_sfnt_off0000f0d5.bin
9f62ef1aaead325d17f1db536b39d54dd3c0bad28eeafa0a3806a997feaa9b45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 16896 bytes

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