Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05abb83f95f1fc8…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 00:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f1516c78844b697f43131506c564690e SHA-1: e62bdadade4963125c03175653a46ac4470cc35f SHA-256: c05abb83f95f1fc874489dd7d3d4c04d843827b6883d2e7b6fec40b131277644
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many pointing to disposable hosting and employing UTM parameters, suggests a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is part of a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=download+zelda+gba PDF link annotation
    • http://trustycctv.com/ckfinder/userfiles/files/fipurokazur.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4cf8cd6c27b8e988a90cc79300101e7b/xenutanakaf.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/8279357530.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/kefon.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109031251227573.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/desulirewijuguxo.pdfIn PDF document text
    • http://euphoriaclub.fun4two.pl/uploads/assets/file/tujesukazutaxeximav.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/kefexe.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/88520700723.pdfIn PDF document text
    • http://allycatering.com/userfiles/95107206337.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/tiloso.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/zibegebumifus.pdfIn PDF document text
    • http://surtek.biz/image/files/20150324_225725.pdfIn PDF document text
    • http://dezis.ru/uploads/files/36982483665.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/subamamelijamotidisaked.pdfIn PDF document text
    • https://ever-progress.com/upload/files/55971024913.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/30630624118.pdfIn PDF document text
    • http://gibisch.org/files/files/81275779916.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/54711918759.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/68748305666.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/57901829336.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/seginevidogu.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/jigod.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/pofufuso.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/62385418178.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f21716bee---99195477637.pdfIn PDF document text
    • 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_off0000b193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 16036 bytes
SHA-256: 1e0fe626c390ef3790923cc9ed78c770655c81a1af780f9a2defa08cdce21047
font_02_sfnt_off0000f22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22D 10252 bytes
SHA-256: f2f1d6b358a85c48213efd32d991c501e62607cfeab1f3e86839b6def0bdc407