Malicious PDF — malware analysis report

Static analysis result for SHA-256 379e19a3005ca844…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 17:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ead40b892c3adfc2bf3762251036c13 SHA-1: c3abbd7122329cfc6a992a7663c16d10bcc543cb SHA-256: 379e19a3005ca84496bb9baf1ad77c3bff6008c795b939c9048541c00104691a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, many pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://ctmmaximoravenna.com/ckfinder/userfiles/files/gemufebanuwej.pdf In PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/72970833417.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/37874843019.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/xabamem.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0b44992e2---59375939903.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/xijugutojenuge.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/32537066127.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/zeritaf.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/73558871277.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sojim.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/vijikiwikup.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/sagebepuxarubof.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/gewavis.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/detifevavufiridilek.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/64043670882.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/73900812674.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/45597892773.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/bapugekulunujesoro.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/4918138253.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399738b1fdf---bigidek.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/madirutanobovejunovox.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/zuvat.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/lesevujef.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/59450031369.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/guganorekuliv.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/21799158153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=eclipse+tools+for+androidPDF 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_off0000d2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 10596 bytes
SHA-256: 9607bf1dfbbd94224ceb642a96608edba1b015dc5092e1f925f40a8fdcc48776
font_02_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 17044 bytes
SHA-256: 0e900c1e143e78cfbec8bef0b434593584f2fe36b1b3bee0036230f16e53d26a