Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb00189bcd17068…

MALICIOUS

PDF

77.1 KB Created: 2021-10-13 01:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3e1712a4a149dac12f333db4ddc04257 SHA-1: 23a3537d9afb3864ef252f7fd0d829e53c389fac SHA-256: cbb00189bcd17068aed6bd72f186f3eb29554b45ee29dd0400d410334558ff7d
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://alakharia.com/public_html/userfiles/file/30822208495.pdf In PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/gesovutexanet.pdfIn PDF document text
    • http://renknh.com/ckupload/files/duxewokexatopugak.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/lotujiwisufisipuvivapeze.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/93c963dd6840355fea875fd829658fe0/votoxigibunaf.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/genirilebupe.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/13116034162.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311390b115f---revawiroxudesojafiwe.pdfIn PDF document text
    • http://doxetrilinh.com/media/ftp/file/wupukevelozadu.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/48837099429.pdfIn PDF document text
    • http://dejonghenico.be/sites/default/files/file/70653556919.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/36931188213.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/runopinezitosedirogibiri.pdfIn PDF document text
    • https://viceda.com/userfiles/file/nusuwedimofujiwaxavikamu.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/xunizipova.pdfIn PDF document text
    • http://palami.by/images/file/vopez.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/gibapakakezipine.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/lalapenivizifarisi.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/8753962691.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/sawaref.pdfIn PDF document text
    • http://www.heksan.com.pl/file/13477611140.pdfIn PDF document text
    • http://idcla.net/upload/files/49855758569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/RhDyTiV0TgQ/uplcv?utm_term=irritation+in+buttocks+after+passing+stoolPDF 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_off0000c85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06F 17728 bytes
SHA-256: 8a56af8c6d21765426edbf8aa2580037c3975a2fa2053f56d77c9e1632f15678
font_02_sfnt_off00010da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA7 10936 bytes
SHA-256: e31d257231518b2796a7f11b525ed1811a848fb5f7572a72931e44047e3a0147

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