Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb5035305aef5b8…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 17:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40dfd5701a593354794d583b319e1001 SHA-1: f6804e2578d5db1c85915e12580596eabedeee16 SHA-256: fbb5035305aef5b8c9fce007601a6dfc2e3b6cf1ed076b15812d6864e1725c8c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with critical and high severity heuristics indicating embedded JavaScript and external URIs. The PDF contains numerous links, many pointing to disposable domains, suggesting a link farm or phishing lure. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • 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.
  • 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=java+lang+out+of+memory+java+heap+space PDF link annotation
    • https://hoakhanh.vn/uploads/image/files/rojusebinubipuvere.pdfIn PDF document text
    • https://eetravel.net/file/86686876653.pdfIn PDF document text
    • https://bselink.com/userfiles/file/kariguwosaporudapujevaju.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/46315653375.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/3288542117.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/luzivor.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/duwebofexodixazupumojupag.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/xemalaresupuponajivosuda.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614189fdcc87b---wologigeduvub.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210902105736.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/14734247697.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/talujinupowenuwamajunep.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/vijib.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/tiziwakomefudazudon.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/devawajuxigen.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/xatitasasaninubo.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/28300098286.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c160d73a1b067cfce577f0737f976a8d/40752744360.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/96448720717.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/91994399191.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/85615572620.pdfIn PDF document text
    • http://12shio5.com/contents/files/tipugos.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/8433788662.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/6780703508.pdfIn PDF document text
    • https://motoralbini.it/files/file/15529518427.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC256 11236 bytes
SHA-256: dba43c67cfe9464a6ecd6c3a6101cd25ade276646a6851ab53196e94867ce3f8
font_01_sfnt_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010a54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A54 22656 bytes
SHA-256: 62224f22ad527292e1fb21e6fae7fef597bb7b6e2178bb85f04a013f956e9d09