Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc92b591d953051…

MALICIOUS

PDF

86.3 KB Created: 2021-09-11 06:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a839a5cd418db0579723803a86534051 SHA-1: 97f5c2d84a77b041c5f09e69e5f6c5d54c795a68 SHA-256: 9bc92b591d9530517dc59d6a7d0d9d7d67cf16d11e4ea42d114259f3896f4215
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a phishing or malware distribution attempt, likely aiming to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://micsys.in/userfiles/file/ripofeliparixosizasipunu.pdf In PDF document text
    • http://skpizzasubs.com/uploads/files/nufijijupolarix.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210908_E8691F308BED192C.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/16735181.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090207003073499.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/51307484388.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/wexisopevozanibi.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/61635034536.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a2377f4de---81099793496.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/35082102675.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/devukapokomitonuzivigaxi.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/wisupemeganutawozerexam.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/dejajodu.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/vosotofibuxaru.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/62144841948.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b6b5cdce---11995892593.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/91029086320.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/porekikokovepo.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/vipotula.pdfIn PDF document text
    • https://protum.se/file/38015556613.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/batijodifem.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/tipujelaxuro.pdfIn PDF document text
    • http://regcureguide.com/files/files/risagotix.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/18128272615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=shadow+fight+2+mod+apk+max+levelPDF 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_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 17976 bytes
SHA-256: 29e4afc093ab45489f33db5f445df618488b09e3c899bd678e1ad2fadebcef0a
font_01_sfnt_off0001196d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13184 11116 bytes
SHA-256: f5b97aee121cbe7c5db164bd19f407a77f7a837946392747b002a04acfc2f280