Malicious PDF — malware analysis report

Static analysis result for SHA-256 b868f7a2bca07a27…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 14:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 14b738f12d1cf8da26166a418c384981 SHA-1: 22898b2c9749cad044441fd3157656eaa201caa8 SHA-256: b868f7a2bca07a27b8377b2e096aea882e158a33af84d41356257bbdebf38be0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to malicious sites.

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://zhbiotech.com/CKEdit/upload/files/sedokisuguxojilepirux.pdf In PDF document text
    • http://uniradioweb.info/userfiles/file/23699765075.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/69315645183.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/powofukixowe.pdfIn PDF document text
    • http://newworldss.com/uploads/file/dufapurugodi.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/61395831737.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/96679254344.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/selojizusivab.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/lowefuximomoniwimol.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/50564168586.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/44809356319.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/63609200582.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/zilibawewuwuzosutakeloso.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1984bd5e4---95850627222.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/nidakan.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/44087511894.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/rusonixedogozomosogas.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/50437284880.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/71010287161.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xuvafoxan.pdfIn PDF document text
    • http://dongphat.net/upload/files/rudidelawataduzidos.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/39620345492.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/29545735525.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/96041970185.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/xunukodujogowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=heroes+of+might+and+magic+3+remasteredPDF 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_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 18960 bytes
SHA-256: 64f2ff00f0402df60ba34d1700f6264e487686e29e1bd68ec37e3c2fb4b32de6
font_02_sfnt_off000122dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DD 11040 bytes
SHA-256: acf462117c569f3549a7471d4abbe8f06048c99864f83a10deea3e08dbafdba4