Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95cc0b1b599e0fd…

MALICIOUS

PDF

72.1 KB Created: 2021-09-08 14:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e08f0706d8e3ed49ffad4d80bf0feb4b SHA-1: 64677691c6171755202750e977c8378d57c3020e SHA-256: c95cc0b1b599e0fd892484d518bdb626db401f1741cc1e6fe985734d42ef9cef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant portion pointing to potentially malicious or unknown domains, indicative of a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://canadanur.com/resimler/files/luzapawizejezimametebus.pdf In PDF document text
    • http://spreewaldatelier.de/img/editor/file/16020979599.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/20045571902.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/pujubo.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/93568110021.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/74606330162.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/roluwumonivugolowaz.pdfIn PDF document text
    • https://svltv.in/userfiles/files/84605388050.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132c284b792c---gixomal.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1630771466.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/denujojibazopalowafonexe.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/gaxivisusizonivor.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/zididateguxina.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/37144876706.pdfIn PDF document text
    • https://kimcert.net/E/file/99215661245.pdfIn PDF document text
    • http://splogservice.ru/content/files/xumiwuwiniroz.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210906182153.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/bijukapizevosomufaxopo.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/aar5ua068i9udm170cbb64tee0/xikotakex.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/saperasovovekusanajoji.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210905_10FB8A9E1E83090A.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=junior+manual+testing+jobs+in+torontoPDF 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_off0000b995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 10812 bytes
SHA-256: 5eea16ed2ace005d47f9ab909a321474e32d7cd5be9d09df989f6275deac57b1
font_02_sfnt_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 15868 bytes
SHA-256: 0c560fdbc2d679a54963443c095d9a48946b14171c3c92c860d9f48532172b37

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