Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2945e3736f5629…

MALICIOUS

PDF

133.6 KB Created: 2021-09-19 05:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 052d217f35c1f2d1889ea0f4e2cc7db7 SHA-1: 387de7c2e7a34ba5e855386b2a604dbfc76a6942 SHA-256: 4f2945e3736f5629c57aeeef872ba97d01f77204c8da0151a75d1da5b418d7e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://righetti-ticozzi.it/userfiles/files/7390952901.pdf In PDF document text
    • http://yuanhebiotech.com/upload/files/3463506657.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/kuvubogijumuxowesefugulo.pdfIn PDF document text
    • https://shidoremicrosys.com/media/42634870194.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/76690884953.pdfIn PDF document text
    • http://mq-water.net/upload/lobidigojapewafibusilunab.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f26ca59ab---92534853407.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/42179578305.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/25357642517.pdfIn PDF document text
    • http://net-work.cz/data/file/xebukotexanemeni.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/zubeti.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/52562205359.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/meguwosifemak.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/71435886573.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/regowiloza.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/jorexikodidumefug.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/warudupanawosuxeraw.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/jivelogajopidatufatele.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/48086411906.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/59221088120.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/sadexapopiw.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/73057039281.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/75087004853.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133b13248ab4---luxiwi.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/88333424047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=miui+12+europaPDF 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_off0001a844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A844 19048 bytes
SHA-256: 996009bced39c49f43c4213fc0d04f122dd2ee8fb72ab1fe6966649c9cced3ff
font_01_sfnt_off0001da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA1D 10096 bytes
SHA-256: 584406b561a0a213d8043d5789799f64c41e6b7e5d54f3c4c03b2dd2a4b6d577
font_02_sfnt_off0001f0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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