Malicious PDF — malware analysis report

Static analysis result for SHA-256 76654cfb64b74854…

MALICIOUS

PDF

72.9 KB Created: 2021-09-13 12:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8fa537e4e296713efa508ea61eb4d17b SHA-1: 744d83a6efb2b7452ad82f28db25144cb5f46c5c SHA-256: 76654cfb64b7485443b78112037251d894f779d7815cdde8cb1f5c8276adaf7e
142 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many hosted on disposable domains, suggesting it's part of a phishing or malware distribution scheme. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=splinter+cell+blacklist+download+for+android PDF link annotation
    • https://csmgh.net/pevron/www/img/file/latodojutakuxexebunuri.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/bebutabafefanumixesuva.pdfIn PDF document text
    • http://intertravel.hu/_user/file/81506881231.pdfIn PDF document text
    • http://rayanchem.com/d/files/rirenadajo.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/xamumodiworu.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/lobisekekimixaluzovogoluj.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/bivegunodabegikowepugegux.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/39900532631.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/vifuxi.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/73352784634.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/67975987837.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/72915111063.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/wupexojinodaxelazew.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/gejujonigiwizod.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/lojofifazenaka.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/63435610013.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/5838808498.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139a4ebdaa89---65938762648.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/45117364818.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/pemuliwisujimizilirumazug.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/2294754592.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_off0000b825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03C 11004 bytes
SHA-256: 70a7a8b0e739a67f61f6bbc82b6caf45fe7afd4e428b47117ad6bbee9b6dc956
font_02_sfnt_off0000e9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C4 17196 bytes
SHA-256: 56c6ad54734c212896004a1c415552731cc19a9d89301a711c19387ffd6ac17e

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