Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf4dd0e902d3fbd…

MALICIOUS

PDF

88.7 KB Created: 2021-09-18 08:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5c940a593df2b28070b6f865e097cb90 SHA-1: 301eb39e2cdfc3291f8a58e1efc15472879fb285 SHA-256: aaf4dd0e902d3fbda99542027215a1fa86ab0c7fcd24cfbfbc3eb311bbea052f
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' strongly suggests the document is designed to trick users into installing malicious software by posing as a necessary browser update or extension. The numerous embedded URLs, including one pointing to 'nomylo.ru', likely serve as download locations for the malicious payload or further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://nomylo.ru/uplcv?utm_term=play+store+az+screen+recorder PDF link annotation
    • http://sameiroeventos.pt/ficheiros/saron.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/barofujemusoxibitan.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210901125332.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/10085679626.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210908171735.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/41936276111.pdfIn PDF document text
    • http://kingdom.vn/userfiles/file/movososefafofelosafu.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/51873452047.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d56487d72a---rinatipekavewoviguvaf.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/wojusevadarinopurawibep.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/jukasetinojerotojeligodok.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/ludorelufegapajilaxe.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/78066410653.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/26335303533.pdfIn PDF document text
    • http://chineseclothingonline.net/File/95241333561.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/megoxepakugukisaxotefi.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/libavogi.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/zenavetuniparupite.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/97363233510.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/32781976194.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/xituxejiziduk.pdfIn PDF document text
    • http://juha.be/_files/file/mopekizufifefenabotufesuf.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/jopum.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/wivikabapu.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_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 17752 bytes
SHA-256: 539ab2c5fb86779d439fc025f4c8debadf5b7369530859beffc008ceaaf2b1be
font_02_sfnt_off00013d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D94 10444 bytes
SHA-256: d6dd3f4389b05d610a1d880974492437d7904e26a2083c0c2adfe2c0f98a5f49