Malicious PDF — malware analysis report

Static analysis result for SHA-256 d730430f4adac775…

MALICIOUS

PDF

80.2 KB Created: 2021-09-16 14:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 72ca6f5992360740225405b491c13cc4 SHA-1: efdbd7a100abe51685d1e195678aba0b858ee773 SHA-256: d730430f4adac775fa2ab03deb7e49acdba878130ac8ad5c58555ed9b79dd264
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://centrlita.ru/archive/image/file/74971843970.pdf In PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/u4utp5a0fja8s91a0onou4447f/ravuweposipopetozir.pdfIn PDF document text
    • http://sooclose.eu/upload/File/92623879375.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/molopi.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/97984788811.pdfIn PDF document text
    • http://consade.com/userfiles/file/60830898803.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/tiwopevivanapu.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/56293682106.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/zabifapabokavomusuwo.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/mamesutixowig.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/7544527326.pdfIn PDF document text
    • http://rs-entp.com/upload/file/16376491707.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/bakimotebupetaxotitixedu.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/sinebevitowupiworojib.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/55179566043.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/69223418180.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/77912081693.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/44707087808.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/60168367033.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/95228813314.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/jajotidaruxanabazolekufo.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613735890268e---ranepozuz.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/62206759503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fifty+shades+darker+streaming+onlinePDF link annotation
    • 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_off0000d529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 17324 bytes
SHA-256: 6269468439d3dd89bb2b463e5a6ef1741b8653fd93bffc79f86c8d409db9beb2
font_02_sfnt_off00011a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A54 10984 bytes
SHA-256: 18a13085685d71387ddb5072666f55ffdc714a7f5f775997c1bb479b5e8018e2

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