Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0dd20ea90199cc…

MALICIOUS

PDF

71.9 KB Created: 2021-09-08 14:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b3088b449b43aa6302efd0b1cf64f7b SHA-1: bcd0d982750bcaca56789447452479990d29753a SHA-256: 3c0dd20ea90199ccbefb220ba90def4c6be59225c387a08f0011220b5c0b3974
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/295223d9b863ab16a338a524a6a5ffb9/15959810718.pdf In PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/72670705715.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/vujef.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/52571580143.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/83725483346.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388e7a24c48---44948020607.pdfIn PDF document text
    • http://expresskaliski.info/file/41817115611.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/runexumetamefavopipu.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/84727659287.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/fefalukotuwuzopaw.pdfIn PDF document text
    • https://onecre.com/images/content/files/movulawezawolomu.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/76041096193.pdfIn PDF document text
    • http://tai-group.com/upload/files/tinetosubogaxijibatolo.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/20069192820.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/99872003822.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/gosilijokisofokowub.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/98974381505.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/92560378525.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/78864246832.pdfIn PDF document text
    • http://cudicio.it/images/file/vivumeran.pdfIn PDF document text
    • http://orenprom.com/img/account/file/95218781320.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/80416089642.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/vigiberise.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/kujobasomiwik.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/rikuvuxasogotomu.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/bikatavebexuvozes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=libros+de+geometria+y+trigonometria+para+bachillerato+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_off0000b6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B5 16096 bytes
SHA-256: 429d6db7d2fe38e6358959ebb9bf0ccfee71a49890f870ea51b702e4bb475b35
font_01_sfnt_off0000df46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF46 11276 bytes
SHA-256: 532c3e05ac5c7807756bac5f36e21ebc28c5a36c5463ceec2e81c6f756cc694f
font_02_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1