Malicious PDF — malware analysis report

Static analysis result for SHA-256 b729f6c361e68414…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 12:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a2d9a6678350e90964a639c3d6b40d61 SHA-1: 4dfb3c97205afb2fa7b467e7054407ddb18a7a0c SHA-256: b729f6c361e68414233ef1e5438bc5a86730a110a5888d027ebffff9587c9522
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=cricket+ground+pitch+measurement PDF link annotation
    • http://ergakiland.ru/files/files/29834020728.pdfIn PDF document text
    • http://hnspkjx.com/d/files/tunuvubujefifob.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/78559615826.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/37204185255.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/58284238281.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/34980248090.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/nivemowezositominevovur.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/bamugop.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/76632497507.pdfIn PDF document text
    • http://grimastone.ru/files/gonulo.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/vibajaxigutiserinibera.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/xawilulodu.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/gaxadikunegazop.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/sinuti.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/55348742868.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/29903045108.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210907060712.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/zulusoratovo.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/gokexej.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/91824618056.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/18301715404.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/51155472853.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 11136 bytes
SHA-256: 6b33a2e4eeb03ead40d943ded29fb32ee3e6ccf4c108dfa8dbb85109c0ce09f9
font_01_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 17784 bytes
SHA-256: 853645800a0e1ca5a64f9e215b63136860d63b5119d519f02fb779511dc049a0
font_02_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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