Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcfc54512dd14de…

MALICIOUS

PDF

91.9 KB Created: 2021-10-15 12:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 343bc667d92281b07de21b6b1edbd539 SHA-1: 9eb16381db01fd2f6c999ca4aace61622507a1b3 SHA-256: 3fcfc54512dd14de0b29ad15aa148a4c68ab8b2302712c31fc38218e7dcdcb5a
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the PDF as a link farm on disposable hosting, reinforcing the phishing lure interpretation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://jokerprod.net/userfiles/file/22934684176.pdf In PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/jiberofimis.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1614b07b70eca0---suraliwegalimelozawemoge.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/guparigobaxogakenefuja.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/lizababuwutiwebadalepi.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021921915306484.pdfIn PDF document text
    • http://patroha.hu/file/soguxifudebude.pdfIn PDF document text
    • https://subarini.ro/mm/file/84032329843.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/lujojafemaluxejixagap.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/6970407907.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615c44dd39c1f---vofokinesale.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/9885104153.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/31187738200.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/32097609931.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/vixoxogurisipak.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/vakixorebujepamalezudibo.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/gedoropefojakifewabuk.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/7701550259.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/fobafewuluwevilizo.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/peridi.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/490516825.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/30663034267.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/83046751523.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/lawedaxalinumop.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20211006183721.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/bojonafilekove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/D9plVHj2VOU/uplcv?utm_term=melting+point+of+molecular+compoundsPDF 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_off0000fdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD3 19244 bytes
SHA-256: 37335d9f2dcf77d47a39ccd614947f783997d382131333cf02b3bc6d7d861900
font_01_sfnt_off00013032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14849 11056 bytes
SHA-256: 4e82088b32b23591f4864611ddcea42368687d1139de9195348139b5caf7d38f