Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5db2869cf689c74…

MALICIOUS

PDF

73.9 KB Created: 2021-10-02 17:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 17af1ccd014e9df5d1d9f409fc1b0817 SHA-1: 1636a43057bf33102f94b73f3bc1b3ef354f04ba SHA-256: b5db2869cf689c74f93382bcdf655cecf01f95e324ec6dac728d574fbcf4f96d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using multiple disposable hosts to obscure the true destination, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://karate-talence.com/newsite/userfiles/files/32941259387.pdf In PDF document text
    • http://derp74.fooden.com/UserFiles/files/nonabo.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/42053716538.pdfIn PDF document text
    • http://come2menorca.com/images/file/16639939426.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/52162529508.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/zobijatevutaboxad.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/67611358492.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/7033264254.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/77367428255.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/18301211399.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/varorix.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdbb583ae2---demopirexi.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210929173326.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1615343d7ea22b---91400149393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=by+my+ownPDF 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_off0000b80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01E 20400 bytes
SHA-256: 03bd312d104d29c0ec824826e6d7fa2064271279889e009696bfacf828586b59
font_02_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 9724 bytes
SHA-256: 1fb5e51cf3d463c83ca086ffc1c885e81d68593db31be3a8465c5224c18c72a4

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