Malicious PDF — malware analysis report

Static analysis result for SHA-256 115bcfbdc37cdde6…

MALICIOUS

PDF

72.1 KB Created: 2021-09-24 02:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 63ff371c3a5712a3d09cda95a478ff6a SHA-1: 7fc2ff15119eeae1eab7fbb6027ae989ce5c532b SHA-256: 115bcfbdc37cdde6aa2149b47923791ec8ad299fef758f3bbe5fd28b5aba2cf8
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'coretry.ru' with a 'minecraft game download' term, suggests a phishing or scam lure. The PDF's structure and embedded links are consistent with a phishing campaign aiming to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://coretry.ru/uplcv?utm_term=minecraft+game+download+happymod PDF link annotation
    • https://studybrilliant.online/app/webroot/img/userfiles/file/sigorejilive.pdfIn PDF document text
    • http://savemaxint.com/files/file/rifevimefasufoponozu.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/18730731627.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/pibetabikamuj.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/89915505797.pdfIn PDF document text
    • https://aildf.in/userfiles/file/4872789929.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/jakobitikemuponuwak.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/guralujuxubujovelolapabug.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210911041524.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/43665013801.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/fuxen.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/965392663.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6133216c4f266.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/80647480422.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/tukitegi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a65a4583f6f445fe2cc7b46725b0b7df/zujejibitarol.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/ridakusimivina.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/39040907569.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109111901096058.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/lizaka.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/98901908669.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/pebunasepelatuku.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1eba94884---73078526308.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/858359152.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_off0000b90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90C 11092 bytes
SHA-256: 8070350b66d100962aeeae6ec9e008aaeccc98651a79da19fdf3d23e07865eca
font_01_sfnt_off0000d291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 15864 bytes
SHA-256: c61e96f743b9a33060a00bd6d69186191452798d0b80360314aff5eb8601ad92

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