Malicious PDF — malware analysis report

Static analysis result for SHA-256 37433d62651c6402…

MALICIOUS

PDF

92.0 KB Created: 2021-09-20 23:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff4cc85316710d1803f4b37f43d6c324 SHA-1: d8b1416fda9a391fc6128c2c457ed01618539ecd SHA-256: 37433d62651c640264adb8e596ecb041231e33189df191a8f194eee5a7fb57af
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm. While no malicious scripts were directly extracted, the ML classifier strongly flagged the PDF as malicious. The presence of a URL pointing to a potentially malicious PDF file, combined with the link farm characteristic, suggests an attempt to distribute or host malicious content, possibly through a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 4

  • 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://clainvest.pl/userfiles/file/maviwejefazogif.pdf In PDF document text
    • http://swhos.com/upload/files/51895482704.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/maluvilobimikom.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/74510705512.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/jupedovole.pdfIn PDF document text
    • http://halaljones.com/uploads/files/30971405085.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/povetijolipogubuvitu.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/47271700639.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/sazilofazixafofebugisuvuj.pdfIn PDF document text
    • http://foxhill101.com/userimages/sirofa.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/dejuv.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/woroxidekesogagunigarib.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/bawenurigegesupawugijej.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/38933890036.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143b79c6587c---lisixofobemepilimemobaxuk.pdfIn PDF document text
    • http://sieuthibds.net/images/files/12998725652.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/67432796645.pdfIn PDF document text
    • http://www.bash.cl/media/file/pebumajuluz.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/91766682638.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/25637855960.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/637234442.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/gudurodof.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/16712463775.pdfIn PDF document text
    • http://getdol.com/page_data/file/tidasamesixabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=watch+free+movies+wonder+womanPDF 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_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 17684 bytes
SHA-256: 0ad7299b71b6569eeab29208075fa16ed0e8ce3d11ea01549be882a176e514a2
font_01_sfnt_off00013152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13152 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14969 10840 bytes
SHA-256: 8e2c7c5f2073ea1a246bb067047b8cda20b0d541d1b3cf9119eb709faad7a7f1

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