Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa74aa5ab7d0c05…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 17:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6d84bc765fc444ce73dfff652d088766 SHA-1: cf5d7f00ee62ce440e43cd8b77dc4046326688f1 SHA-256: baa74aa5ab7d0c054da26d060148c3155381de8b34b1982d8a2ddde146aff0c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=counter+strike+global+offensive+apk+android PDF link annotation
    • http://lesen-und-schenken.de/userfiles/files/wovejumepasukojij.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/28697221430.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/73859512423.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/31600602986.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/dataxojumikezazakinew.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7f951d39d---14534045014.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/xeban.pdfIn PDF document text
    • http://ilink.pl/userfiles/file/mabunulasujaguvidugu.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/2780338291.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/6236993299.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/85330920426.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/32702016973.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/95061928932.pdfIn PDF document text
    • https://costarica4d.com/contents/files/29063929325.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/83217046497.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/kufifulirotexe.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/80856212657.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/mezotuxuzogi.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/duzibewajasoxo.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/52261155399.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b885aa55f---davudidomorazikixo.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/watutidugiwalesopuzibetor.pdfIn PDF document text
    • http://nineslash.com/user_file/file/fomofog.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/bukimut.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_off0000adc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D9 15312 bytes
SHA-256: add1d4504944a5b2db58f153c21a99bfb31a2277376edd9562d0891d0d3c0a7b
font_02_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 11104 bytes
SHA-256: 97f736b6af062ba4d9139b5df3c46780752cfa91d0213530861b00bd91e17bd5