Malicious PDF — malware analysis report

Static analysis result for SHA-256 20936e75b7253885…

MALICIOUS

PDF

96.7 KB Created: 2021-09-18 09:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5d897ab4bc42568871c0269979e92f48 SHA-1: 79c2ebcc6546c38545fc1551f8927f2099c86b86 SHA-256: 20936e75b7253885b26b5674c1dca71feee99daa7cb49b81bc9384dfa63d938d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to domains that appear to be part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://santamariamikado.com/uploads/files/kivutovopaxazu.pdf In PDF document text
    • http://biirbeh.mn/images/content/file/tagabedadamatunibibub.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210915204245.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/50218388263.pdfIn PDF document text
    • http://teifsepahan.com/files/file/jowejoruwigidugojekapo.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/352215631.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/legexinalewepalodetibu.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/23084037837.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/fetijedadakerexunudevu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1a50e6a11---93480583450.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/48463013364.pdfIn PDF document text
    • http://huiking.cn/uploads/file/021745522138.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/96362183072.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/xowolitufanijen.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9e349e57e6be595fc78991e2e229f2ff/fatasubegudokome.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/61352180e8391.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/bezoxedaraxujipupoja.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/340870638.pdfIn PDF document text
    • http://ccsl.asia/files/lijadovu.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/jutodugewana.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/lakawawilipeputiruran.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/fovan.pdfIn PDF document text
    • http://machulski.com/public/file/fofetugotuget.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/30023733457.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/1916685311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=on+screen+student%27s+book+b2+answersPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/52976969042.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_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 10824 bytes
SHA-256: b49e9539ed24865c58dd7ec24a3f1ea2cf08ad19930bc0178f8b9e1a9bc5f56d
font_01_sfnt_off00012e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4A 17844 bytes
SHA-256: 22e327ac17c00a57324f85c466c74a222c89c30e9151f86b094659e6f9e6bf07
font_02_sfnt_off00015cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1