Malicious PDF — malware analysis report

Static analysis result for SHA-256 7caf8c8c388a2da7…

MALICIOUS

PDF

71.5 KB Created: 2021-09-16 20:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c95c7dd41171f49dcd787576c402d77 SHA-1: 9c1810deee60594ce8b373aafdb9e711d0264ec3 SHA-256: 7caf8c8c388a2da75ae1ec289c48aefd8df63a36e371c770cbc44a12b62170df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious websites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://archism.ru/uplcv?utm_term=double+floor+home+design+plans+3d
    • http://diakmelo.hu/ckfinder/userfiles/files/gokosovalekir.pdf
    • http://tamlaproject.com/userData/board/file/74317735542.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6b375e669a6924169fb6f9321eb2f504/82858092242.pdf
    • http://heaig.org/editor/ckfinder/userfiles/files/14917991228.pdf
    • https://relans-nn.ru/images/docs/file/34986634129.pdf
    • http://sk4education.com/ckfinder/userfiles/files/rimix.pdf
    • http://maraulsan.com/ckfinder/userfiles/files/1364692693.pdf
    • https://idosekotthonaveresegyhaz.hu/files/files/46739032838.pdf
    • http://kubabus.cz/novy-web/upload/file/peroperovugawe.pdf
    • http://tofuyatogo.com/uploads/files/wivesuti.pdf
    • http://dawahcity.com/userfiles/file/62074796445.pdf
    • https://saikekanglun.com/filespath/files/20210905122139.pdf
    • http://4998horo.gmmwireless.com/contents/files/50943894176.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/6164700868.pdf
    • https://camphacement.vn/upload/files/tebijuzalokomurapajow.pdf
    • http://hatowo.com/app/webroot/uploads/files/fikovi.pdf
    • http://elcampoeco.org/FCKeditor/file/bapataxusevabovejotako.pdf
    • http://xmst.com.vn/app/webroot/uploads/files/55738368404.pdf
    • http://yachtales.net/admin/userfiles/files/88540103809.pdf
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/tezalasilukulenuresagu.pdf
    • https://majubesar.info/contents/files/65504562234.pdf
    • http://lineshare.net/upload/files/20210917004726.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/78287303098.pdf
    • http://theclubburger.com/uploads/files/sejejajidel.pdf
    • https://loctra.net/userfiles/file/sukizejepaxovujilux.pdf
    • https://peterdegendt.be/file/85179386496.pdf
    • http://sushimura1.com/uploads/files/57922020395.pdf
    • http://f-okinawa.com/img/tmp/file/90150572929.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_off0000b8fc.bin
433449f22a6d700ca0a470e8808b816660773efd0a27f13a1acf346b22a38a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8FC 11260 bytes
font_01_sfnt_off0000d2bd.bin
77e0088ad72de9a4fdae54837a5141566d8f768a991dc76c5d6de6dddecec57e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 14736 bytes
font_02_sfnt_off0000f7e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 16792 bytes

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