Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b0be2e8f39603b…

MALICIOUS

PDF

76.0 KB Created: 2021-10-06 00:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 828817cc312e4dfab7d55927f81c5b02 SHA-1: 7f2d94b2f4ca3a98ac929a6af15a30cd5f4dacbf SHA-256: 49b0be2e8f39603bc9489dc7038621decd64ec14228fede86778236682951999
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, one of which is a PDF hosted on 'lncxjzxxw.com'. The embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://lncxjzxxw.com/upload_fck/file/2021-9-21/20210921025249725863.pdf In PDF document text
    • http://ageofwonders.buka.ru/sadm_files/wadurewuduwe.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/ridavezowodopa.pdfIn PDF document text
    • http://orthodoxnews.us/file/ralilavalagufipas.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/6155920015.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/6994968896.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/gexajitumanukuv.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/titilajexomowuwir.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615c613c25cf0---vemenuwi.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/95657146695.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/widigefikofoleru.pdfIn PDF document text
    • https://lerivagedesmilleetangs.com/caningest/images/file/daxufuniro.pdfIn PDF document text
    • http://sin-hua.org/userfiles/zokeforafukipa.pdfIn PDF document text
    • http://dd-eng.com/files/files/48235234674.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/sujokerivasonugijegilok.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/jijofinijibexogab.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/tudisas.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/31504348658.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/gomivomi.pdfIn PDF document text
    • https://olterus.com/contents/files/desaxageguxizozofupuwun.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/88513478577.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/xulegagifi.pdfIn PDF document text
    • http://tokado.ua/media/file/jubiroge.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/53243372889.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/55029029715.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tum+ho+paas+mere+download+mp3PDF 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_off0000bd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD10 20120 bytes
SHA-256: ea8aa2e458113dba79360aa51f1d810c3a435cbf9a14cbd5c2cab7bf83b820fd
font_01_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 10788 bytes
SHA-256: 458843f542ac68c63e51ef9f64c01c6ff753c1e0e995cf94eaa43bd05ebd82ed

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