Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cacb5ced3a70ee4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 12:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29a7496239cce0e688ef8eb1355229c9 SHA-1: 73d63ebd83278b10696ba5619f6331692c9d0912 SHA-256: 0cacb5ced3a70ee4ddeb560a49e54deefc3102284e7a4d5fe7fdaa0023c5d08a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to potentially malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are part of a link farm designed for SEO manipulation or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://hagelkonzept.com/userfiles/file/86840286800.pdf In PDF document text
    • http://veewood.com/file_media/file_image/file/61947540936.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/69226830913.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/83571008771.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/51014334582.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///vaguzubaw.pdfIn PDF document text
    • http://ibb-online.ru/f/file/28145719677.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd21bf74a---poxaxiboxejoxi.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210903122946.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/52896383822.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/60232239434.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/80861949032.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/37737966300.pdfIn PDF document text
    • https://anakmeong.com/contents/files/91627612962.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/30175700020.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/52006518466.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/31537098090.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210906_040644.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355dd391f49---tumenezipugiz.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/36487368493.pdfIn PDF document text
    • http://119pump.net/d/files/65352948637.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/senasoju.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/jenobekurapajosilufope.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/lupodemazesoxoki.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/tijemafozajidet.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/58952250818.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/85783009918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=use+of+xender+appPDF 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_off0000dd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 10364 bytes
SHA-256: e8b8a2734b035a3d29f2343fdb0f92448fa9acd410c8bad27b7cff970098bc64
font_02_sfnt_off00010cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 17276 bytes
SHA-256: cab4a94eeff8f8a6d83f0fe30f4d740b40681dc49a38bae3806d3bda5449f90c