Malicious PDF — malware analysis report

Static analysis result for SHA-256 7516312c59a249ea…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 23:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea7cb2ad1115dd97c4eb1dbc24c367ab SHA-1: 4a9ef1c1345fc15cc667a42cbb6ce6af16984821 SHA-256: 7516312c59a249eaa7c6c9d26bd93929a276cc1c7af7765499f090c0ab71e05e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is part of a link farm, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://irlanc.ru/uplcv?utm_term=acr+app+no+sound PDF link annotation
    • http://www.bash.cl/media/file/42940389153.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/reratowezizoropine.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/29504560942.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/15254777252.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3eemckue3gfq9de8i2hbnabij3/viliwilalosulobedodom.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/2069216372.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/3812899980.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/62909160546.pdfIn PDF document text
    • http://unityproductions.com/upload/files/41632615861.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/xufimijawabux.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/51757681713.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/42737899014.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/99147173032.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/42030608657.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/47839459110.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/3652073605.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/81287571645.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418caa80d9c---metinupatujuwewonaka.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/90132981796.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/21417713498.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/zaxogowunusapawajulo.pdfIn PDF document text
    • http://jinyezi.cn/upload/lebimopiburodefewaze.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///20933999155.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/27663392613.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/tajep.pdfIn PDF document text
    • 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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 10220 bytes
SHA-256: 69956572b5a063fbcc23357cf26d71b694322e30275189ad429a3a9e1263b49a
font_01_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 16880 bytes
SHA-256: a0c0be696b974cd2cc0056052fb3e70bf397b5bcf36593b5f3d5a67fe45b9877
font_02_sfnt_off00011c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1