Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9ac29ccbf63871…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 22:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cd1230eb52766d88a5dc0924e575be8 SHA-1: 3a5ad6178db454c6c2ca68011df8d62bdbb298bf SHA-256: 9a9ac29ccbf63871b36b0885c2b5b759ef1ff228df93e15f71b1a4620a51075f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, indicating it functions as a link farm. Heuristics suggest it's a non-clustered link farm on disposable hosting, with a high ML score and ClamAV detection confirming malicious intent. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://pixomot.ru/uplcv?utm_term=kodi+para+tvbox PDF link annotation
    • https://vongtaytramhuong.vn/upload/files/pixozolisorefetej.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/bitekefazakobugufufov.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/monipolefutupefiwawopawe.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/73a96a67ebbb14f46fbfc57e198fa9dc/kusavizotidamuxinozagak.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/5731152661.pdfIn PDF document text
    • http://machulski.com/public/file/pexew.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210911_034454_114.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/27683226368.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dolisixazonoso.pdfIn PDF document text
    • http://checopharma.com/upload/files/bilonilotebosixefojal.pdfIn PDF document text
    • https://ocw.tw/uploads/files/fagonegatenujususulav.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210912_4860668BB96FB2CF.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130753192023---tugosakukunurozusu.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/kimemuxigukulodimeva.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/renupadubusenemudateba.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/movemubiboxi.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/ligosanesov.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/54336898366.pdfIn PDF document text
    • http://www.perlodrink.com/documents/97611481101.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/doniratagedavido.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/79032474855.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/jiveregodawarobubuno.pdfIn PDF document text
    • http://e-sheremet.com/img/57400783988.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/27182637898.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/852121282613ce7fcdb850.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210923135703.pdfIn PDF document text
    • 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_off0000b34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34D 10232 bytes
SHA-256: f04e053f86014d3b36f8fc9e8b93a85ecb44d94fd7e9fbf118feb19f67f4be98
font_01_sfnt_off0000ca35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 17060 bytes
SHA-256: d261fbf22606e403522fbe9b553a1b4d9ae0f21b1fe0c3c14b013b2d0a83ec69