Malicious PDF — malware analysis report

Static analysis result for SHA-256 d898649182ee75d4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 00:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb1f5cc2a90870589123d546e8aaf7fe SHA-1: 578d27f2be8c0033378185830ae80c4d26d07921 SHA-256: d898649182ee75d4a9eacafc7e75a5e0093871589bfbe206310d7000a52e5e94
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm designed to distribute malicious content or phish users. The 'wkhtmltopdf' authoring application and the presence of numerous external URIs are common in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=how+to+install+icon+pack+without+launcher PDF link annotation
    • https://njshore.drinkpoint.com/uploads/files/xowiwoginixetegurazupo.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/fileber.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/54794096929.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/95366833674.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/fexal.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/nefezidobupebabivajewebaj.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/7611953401.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/96050295561400d487d548.pdfIn PDF document text
    • http://turatabor.hu/media/tuvasevewerisijezinogux.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/47070962833.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cec9abd48---88509108212.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/nuzuv.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/wifuforafuwijokozun.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/73037906214.pdfIn PDF document text
    • https://spacio.hk/attachment/file/24400418803.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/22541197876.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/8765495685.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/wemodumavugakigosugav.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/tibofi.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/40996721319.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/wafumodaxosewa.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a728b9ed8---lazuvuxenelawuto.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/febidugeririmozoduxeva.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_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 10740 bytes
SHA-256: a23373ec73274a676aa12a464bd6ce5490c25d4d46b7b8c63179fc00fbe3db72
font_01_sfnt_off0000f84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 16864 bytes
SHA-256: b8272a70bcad4d226e53de440234014ad40ceddab0d4cedd449ef2700cf7f52e

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