Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7fe07d4ab7d2306…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 09:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bc92a30b46fd122babb7430e97c3245f SHA-1: 752baffacfe4ac1060dd612465ab9e34d1e36099 SHA-256: f7fe07d4ab7d23066d6068382ca471407a66ffdf1d648aee27056a2f073f11fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of malicious intent, such as phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161415efa266de---53319254245.pdf In PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/tasidabikapoxanewuxi.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/35672192576.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/45111649743.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/75655462553.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/56520594854.pdfIn PDF document text
    • http://geose.ru/userfiles/file/88406677917.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/wotasetezemotasoboxen.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ed8fkrfhbaiattv9cvfjpo55om/75980985587.pdfIn PDF document text
    • https://kimansion.com/uploads/file/divufalexazolazis.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/kisimifobotidotope.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/69302894654.pdfIn PDF document text
    • https://kultmotor.hu/images/files/57438110634.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/25941416945.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/5863691781.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/30172497242.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/47234565875.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/sizobesixopub.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/57314960019.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/beluvoninodotu.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/81732974069.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-13/20210913145706446630.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/ratavuxixax.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/82458465464.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/vafiposupenixepidi.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/pijuxifoline.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+game+oregairu+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_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED91 18372 bytes
SHA-256: 5e4d75a9b73c6b03b406d4386c5a3befda2ef8872c0a9b4e703a0e840e910ee4
font_02_sfnt_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 10512 bytes
SHA-256: 61ab7c1d1ea1bb3e87bcb61894b6e1af1ad32f64e611299b16049cc9ed6b84dd