Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53b8e549376ded6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 18:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 94ecbbb792d72652168d8d9e4edb6c10 SHA-1: d031a184a28751c713c1ef78a95cbf23324701c8 SHA-256: d53b8e549376ded6a0708b7fbafaae72007728c7d315c092f7c3caa4d85312e7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing lure or download a secondary payload. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://idealist.ro/userfiles/file/37097663546.pdf In PDF document text
    • http://getvisa.ru/images/File/17593476156.pdfIn PDF document text
    • http://imoroz.by/upload/file/sitinoxudu.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/28815116866.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/kofenotugajuriledasedor.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/suzifatibe.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/bovixa.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/54798070851.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/faxerevox.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/77962066840.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133e46f987c7---1496624055.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/18120183963.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/53677544585.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/mepuzojugokupanizepinebav.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/vesedotedusok.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387b1e1b73d---fagosexosorozejunedefu.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109060555024502.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/kipalaramopozizifuli.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/60177710729.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/mugiwikegegojun.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/83841746858.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/1206081314.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/97597778688.pdfIn PDF document text
    • http://iccjsc.vn/images/uploads/files/78807381083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=installer+app+store+sur+androidPDF 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_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 17940 bytes
SHA-256: b2818f6b6a0aad8928c05343ac10cf511c1b5d637be3a621fdb53e89aeae9f94
font_02_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 10436 bytes
SHA-256: 0a93324a996daec1bfbad3521d4c4daa4cd1c6f049d68f63effe38816adc585d