Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39ef01ee1b9e519…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 09:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78da15bf75d1c3bd5abf0c64f5161a51 SHA-1: 2bf16cd8e182f6836a9be69251af0bb6ecf117c6 SHA-256: c39ef01ee1b9e519cf18a36f96d510b498ca13b8c7ae41007fdefd1bb75a3a42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to external sites, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the presence of many unknown URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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 http://hometextiles-consultant.com/ckfinder/userfiles/files/73053425699.pdf In PDF document text
    • http://www.sctiec.com/up_files/FCK/file/70714254555.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/4302365600.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/jeletokogerovesap.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/11456633547.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/92141635504.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161345f2bdfa9a---xikubutijopel.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/lapuweza.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/lukekodu.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/tefikafokedigokezopu.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8a98ea74c---38092689557.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/zulutikidaf.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/89330019936.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/87727714082.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/73879022842.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/kowolokudowokebina.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/zexagozokob.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/lumamelejaviz.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/zorojawefokisoruzugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+stanford+prison+experiment+full+movie+freePDF 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_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB56 18424 bytes
SHA-256: 3ade3b36b717845ef28992d8b040085f03686f1260cdadb5a775a7cd2fff0e12
font_02_sfnt_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 10996 bytes
SHA-256: e2f6895c3e247584b2fb3d853351248633776253908669930d97a009a19a8064

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