Malicious PDF — malware analysis report

Static analysis result for SHA-256 e658c1e21a49cdfb…

MALICIOUS

PDF

102.6 KB Created: 2021-09-16 02:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 68a42d453b1b9bea87d2187c6065eee9 SHA-1: c039e7a18039cc5dc47afd616637853d64ec05a3 SHA-256: e658c1e21a49cdfb1af4540ac32a8838d9b535a3dbf274efc5253054859df427
132 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. It also contains numerous external URIs, including one pointing to 'coretry.ru', suggesting a phishing or redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting a malicious intent to distribute or phish. The embedded JavaScript likely attempts to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5499

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=kung+fu+hustle+english+dub+stream PDF link annotation
    • http://zhengfutz.com/v15/Upload/file/2021913214719279.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/naperugef.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/rqiacvd5s9c7c0ij70ulpqju72/setumedi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161340eba59b85---29540280136.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210906122746304.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/67867097034.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/makalazuvupo.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/vimamujebenewizazuwunolo.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/46349426153.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/nidat.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/niviwoxifuzababi.pdfIn PDF document text
    • http://jucal.es/images/file/jetitubaresadolu.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/juwepugaf.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/tujodinigamejajosu.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/rowojixewudiselojavujuv.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/61647472756.pdfIn PDF document text
    • http://4rrecycle.com/files/file/bexuzuzipedixeges.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/76495533208.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/34653172042.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/jojugedibuwe.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/gezakexixemomaxuwifej.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210903_C9B6DAE330C49F18.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/zesukuzubilosogewo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E63 10912 bytes
SHA-256: 328b32b969ac6274cbbdcbf1ccc0b2bd7034d50b5c162bda0982cad29bf02109

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