Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3518b073ee0b03…

MALICIOUS

PDF

80.1 KB Created: 2021-09-22 15:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c63b26255f488805575796843ac70a05 SHA-1: 9fc57ffd003019fca8f175b2e86855e025dea8ba SHA-256: ad3518b073ee0b03a341075021cbac37144b178923f91fef70016baf4ef0ac43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms this behavior. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://fskyok.com/uploadfile/files/71891407433.pdf In PDF document text
    • http://dogomanhnghia.com/uploads/files/93846146780.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/xugamo.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/bukifafuzugebel.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/giliruguwazev.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/fupidewuromobavisezavefow.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/gevobadebidi.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/pitakidujomuzunis.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/sipibitif.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vetuzawarus.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138bd12b79c4---86254457032.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/favotidewuwarided.pdfIn PDF document text
    • http://ubest.ru/images/file/57912129149.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/44af2c439db0beca77b324d41c57a72e/nigovulukavejaputurinof.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/85411415049.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/74256227419.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/1360034277.pdfIn PDF document text
    • http://npas.ru/pic/file/89832801346.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/kejupupop.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/49806058621.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/todilugowipotewe.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/82651434162.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/40653390771.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/kunidi.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210908045212-woguxewiwufupenudepaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=download+game+total+conquest+offlinePDF 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_off0000d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 11052 bytes
SHA-256: bffe0acf248e5a084bd8b61f33fd9634b0793e447c66933d259bba789c475818
font_01_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 17808 bytes
SHA-256: dc802eb691456b6016c5c5f8d54c187c687b55430d0edb2530163718070f8b73
font_02_sfnt_off00011a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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