Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5aec628d3c99e1…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 22:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 834a424efeca2e98a6971294e70d28c4 SHA-1: b39c8edf29724200f9198eb6eaac75ae70d1e49a SHA-256: eb5aec628d3c99e110672e035e5310c301005c4795b25e81f2fa45155c186978
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms or disposable hosting, suggesting a phishing or redirection scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=app+cloner+new+version PDF link annotation
    • https://pasationtravellers.com/root/FCKeditor/file/zosomawirizap.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/86263811585.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/lotojusazewufimag.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161351e1de01ac---89233318547.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/xiniluxiviwuwepo.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/1966105326.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/riloxawi.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/10305002697.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/tukejifovisuwezaz.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/32975602731.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/67314561049.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/34433776970.pdfIn PDF document text
    • http://koutingchina.com/upload/files/96492547626.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/91054188520.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/23240425590.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/wenevaz.pdfIn PDF document text
    • https://campermagazine.tv/public/file/45459332662.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/96119499446.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/wamoroj.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/vatubemuvusubob.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/95227413821.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/03/kotagokosokomezagodakupuf.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_off0000e101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF918 10240 bytes
SHA-256: 26f3a9e67c1ff13249567488ad1908568dccf0d42ae9ef9b7af5c2a7d96bf2c1
font_02_sfnt_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 18464 bytes
SHA-256: 60d1da8cf96008bfbf7acbcb304307eda563a746974f4838d364c8cf54425779

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