Malicious PDF — malware analysis report

Static analysis result for SHA-256 de76ee56c402d190…

MALICIOUS

PDF

79.3 KB Created: 2021-09-19 05:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ee8d81ef5c8c3f23e2e9cd0da7342e5 SHA-1: b29d06131f1af0b5f0fab958a0f83b5ebd79abba SHA-256: de76ee56c402d190250dc9ab9983458995c9181439a23733f179c6010e6a6faf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to PDF files on different domains, strongly suggests a link farm designed to redirect users to potentially harmful content. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically identifies this pattern, reinforcing the phishing or malware distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=elite+beat+agents+rom PDF link annotation
    • https://gsm.company/ckfinder/userfiles/files/61207119083.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/tusavetaroxaz.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/xupimawoxiwiwimuraxomikat.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/41892113061315d832c9ab.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/44715353586.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/16623777838.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/dizaxanovifirifiw.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/33562350704.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/80656747354.pdfIn PDF document text
    • http://mebco.ru/images/file/vofexemivaloxunupoger.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/16725753864.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109081929566894.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/vobuwesafezitutazizosubu.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/55504489386.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/40927947559.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/92565885637.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/xeburipisezo.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/vobevoxikotomefojabubis.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/warowedigopexologekije.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/21256247847.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/zavorasupotaliv.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16144ae67da7dc---48150234334.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/golamilovu.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_off0000d20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20C 17584 bytes
SHA-256: 47ed093e46f2ee350c8b6a6a04327580e5247d07d263016928cce2742ebfbc35
font_01_sfnt_off0000ff73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 10572 bytes
SHA-256: 15e9037cd6adeb07fbfc3485565b192596235c69db10af9b0869a802174ffff3
font_02_sfnt_off0001178a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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