Malicious PDF — malware analysis report

Static analysis result for SHA-256 133592994aa2945e…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 02:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cedd498e9fd1fd8643eb040d23b98963 SHA-1: 94f1865d59f634b9b9140b7cdf3eeba289a88c40 SHA-256: 133592994aa2945e763a087ea05108ab852f60e0ce72ef50ffa0e03991ac01e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The presence of external URIs and the overall structure suggest an attempt to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab5028343a---12180505828.pdf In PDF document text
    • http://kramor.bg/userfiles/file/kuvizetijosibisod.pdfIn PDF document text
    • https://stopserv.ru/files/file/88290776444.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/debaf.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/xiwerogozuluji.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/tivovoxe.pdfIn PDF document text
    • https://techlan.pl/files/file/sodedixalopejumumotixosin.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/20860170400.pdfIn PDF document text
    • https://ewt.cz/res/file/61660944142.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/15535593895.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/16463853204.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/xebuwetexupidita.pdfIn PDF document text
    • http://soc-in.com/data/media/files/lamevakafowuwafu.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/2390477701.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/fotunixeba.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60684884711.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/zafokojinijepunovodeviku.pdfIn PDF document text
    • http://palami.by/images/file/bajuwalupezaba.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/pizejofivavafiravo.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/diximiniwavotidepodiwapa.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/tivopaz.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/18483338910.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/gavarirotapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=arcore+playground+patcherPDF 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_off0000ad54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD54 14972 bytes
SHA-256: 0505ba2747e2e321db76f290840a93d27deea3acddb079b772010bea2bca580a
font_01_sfnt_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 10728 bytes
SHA-256: 7a919e9fc565c15804fb5b44eeece56375fd9f87cf883536e818c0490586cc91

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