Malicious PDF — malware analysis report

Static analysis result for SHA-256 c513879b5bc060b2…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 00:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb2711b28c28cdb8029844875dbc123d SHA-1: e33366fd069217f93841aa99f3c6aa1daade939e SHA-256: c513879b5bc060b2891b32bdd70d353cd1c017385ab09d224e3cf14eb2845d25
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to external sites for further exploitation.

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://auroraenergyproject.it/userfiles/files/kenubozenu.pdf In PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/vefewesaxewewemomep.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/5029073944.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/refodovideba.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210906175417.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/70291776502.pdfIn PDF document text
    • http://poiskvod.ru/images/file/23884285441.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/52932619660.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/tufemurirasol.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/gedipazonupalepedanasalas.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/goposasuvimojajagaxa.pdfIn PDF document text
    • https://mimpidia.com/contents/files/kavatoxizefetenodajesarim.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/69991003180.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6e81a7c7---52506146052.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b628e139f9---43982373376.pdfIn PDF document text
    • https://12shio1.com/contents/files/60500194490.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/26312989496.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/sejuzumefuwafakoxodok.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/meganezikod.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/35275002136.pdfIn PDF document text
    • https://izometal.net/mm/file/55041728761.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/tewesefiruxe.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/wibifuloxusotoliwu.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/kugebi.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/12evu4ho50v12i92fk998el5qf/gefenuw.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/neliloxikexazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=after+twenty+years+by+o+henry+pdfPDF 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_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 10776 bytes
SHA-256: f3997ea71a44ae987c53828791286d6a710baec48f355ad46b3ae5af09d792c7
font_02_sfnt_off00010f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F08 17672 bytes
SHA-256: 661d8b28384922b7a2c71c039076a20527ca5df2188bab7bd13f260573fe6f76