Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b965fba2a004fec…

MALICIOUS

PDF

75.2 KB Created: 2021-09-23 01:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6a6e5567d361cea79a2cfa7057475674 SHA-1: 6889173e0087089973128f7ca86a706909753a60 SHA-256: 2b965fba2a004feca758a9869dc901623a6ec1270409d5f6bb5fbd727d9d44bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful sites. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt.

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 https://santa.my/images/users/00000000/files/mijopajufu.pdf In PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/50259833119.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/rinexokokawosegifirugi.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/64865073069.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///mabuminuwidojafapelus.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83831749459.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e47919365e---1109452002.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/85792641211.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b12100b479---senezufebubawiju.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/pozesupadojukobezi.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/38214864934.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/78210633703.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/solirakudege.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/wenozeferilupapet.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/woresulikun.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021090721032378981.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/vodalunagakanajipazuv.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/19628638621.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/54187929384.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/wefusezupabajenudev.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/poxavaxirumuwowudonixedap.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/xobavagerowewipokijemeti.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210902_031628.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/12861271410.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/41244988673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=message+inbox+full+androidPDF 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_off0000c324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC324 10764 bytes
SHA-256: fddf8cc4eaedf6300db28677a66076219a374406c1333420298913caa0d7fb06
font_01_sfnt_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 16964 bytes
SHA-256: dc9e64edbb5ac90d80caf2ddae10a27e7c8ef6c961c2c34cbb14cad23c71cc8e
font_02_sfnt_off00010735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1