Malicious PDF — malware analysis report

Static analysis result for SHA-256 263c0e1564b3234f…

MALICIOUS

PDF

71.1 KB Created: 2021-09-11 04:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a309db79730f742a8684391f35663fe SHA-1: ecc1e7023c09ef6c4322d7173610e9d1b14d2f18 SHA-256: 263c0e1564b3234fc68be36757a9644c8eb5bdc6b8ff709a074898abdcee9371
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. The presence of numerous links pointing to disposable hosting, identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggests a phishing or malware distribution scheme. The embedded URLs likely serve as lures to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://blgjad.com/upload/files/16184888424.pdf In PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/32964529557.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210902170731.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/87954502903.pdfIn PDF document text
    • https://actorconseil.com/files/file/guxagapafajiwedube.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/nufavodovisep.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/9609066377.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/69324310119.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/18501427662.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/41136917060.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139918b11564---dibed.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/55402178891.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/76315854506.pdfIn PDF document text
    • http://artepcb.com/upload/files/wilewevojofonirofumuk.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/dudebepoxori.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/83629640940.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/xazudageroxisun.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/mazogexijuxivilo.pdfIn PDF document text
    • http://scantech3d.com/files/papirugaru.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/limowazamugogo.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/karapeborujebef.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/37110709314.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/07397f0bdc30cd57c5a034896114d86b/rixurore.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/birexoxaruxixubirokifi.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/50682534050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=cricket+game+download+for+android+mobilePDF 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_off0000b53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53C 16052 bytes
SHA-256: a7779efda534ce14021a9b06e680e89d4fcfd42ef1ef9cff7f92dc9479373299
font_01_sfnt_off0000dd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD12 11000 bytes
SHA-256: 8284ff46a4964243891af6ee78bb7eab2b8b8acb768f429de9a545193ca17991
font_02_sfnt_off0000f689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1