Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e707386e7a15d51…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 00:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6a9b826522320710f8b3bb994d92ed47 SHA-1: 5b510189c494d95869a87d2dc39073c95318998f SHA-256: 2e707386e7a15d51d250d11da9cb28daf438b1378f222bfa3e31f193479896e7
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. It contains numerous external URIs, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a tactic of using small PDFs on disposable hosting to redirect users, often for malicious purposes. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=va+approved+condos PDF link annotation
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/58533693590.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/89178477083.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/74040726399.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/81238080175.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/91096756548.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/zuvekeredufejop.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/dekixolu.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/7473578386.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/76203290667.pdfIn PDF document text
    • http://shen-su.eu/gfx/userfiles/files/59202870489.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc6e01976---rikibugazinawikorisof.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/wuwawakugu.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/vupanonebogitokisedu.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/dodagebobozenikemabovop.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8f077e87b---2986584160.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/50253914235.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/lenepekesawazob.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/nodimirepatepotowutoma.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/75231630775.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/nenivasovibamoneta.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/nafikibujofede.pdfIn PDF document text
    • https://hssanesteban.cl/files/voviwif.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/tovafo.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/40306883554.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/pivemotax.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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 17468 bytes
SHA-256: 50f914390cc78f1c86aa220f26746920959eaad57458855e7a3a17f99b0a6494
font_01_sfnt_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 10304 bytes
SHA-256: dd3ba93822b67ad9aa4de0288130c878c205c67f98bfe0663be5fe15bf32e96b