Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d5cbca60039cba…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 00:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f28ab86b1d20222e5bedeba598553b07 SHA-1: 3cbc7cd22d709074d1f90a90ed90667da4aecaca SHA-256: 42d5cbca60039cba07b28695c7524640e54c5cabb99fe7c2ea76bec60cab6d1e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://stka.gr/ckfinder/userfiles/files/77470868104.pdf In PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095690bfa5---6106773792.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/takitu.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/33084120958.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/17892574149.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/44186820986.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/82985088006.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210911201519754250llnxk9.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/69186123504.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/30178320745.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/xiwalivawoligebe.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/20719239252.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210902132940.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/zizawimalun.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/10/favevibin.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202191747549343.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/36968390135.pdfIn PDF document text
    • https://stvorki.ru/files/file/mekozu.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/nopewofudokowiwetik.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/35979365998.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a762456de---wuvenanapebezerim.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/mamidewumodazemele.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/bojikisajowub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=cutepdf+evaluation+free+downloadPDF 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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 20044 bytes
SHA-256: 2ba0e0b19dceed6796861b20c044818dc6b0492ee67330553d78422538f6ecb7
font_01_sfnt_off000118a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B7 10604 bytes
SHA-256: ed0e433da76ff969151ac52e41809d4279915403bbfa04fc7eb3b433c9fb7e53

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