Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5c6cd256964944…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 12:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7eded3311133360c05bd76ee1128628b SHA-1: caf56ffaf73866c3cfffcb176e56b3cf4a37ca6f SHA-256: cb5c6cd2569649447ef462dada2b3d4200a37b777067519808f4b3eb4ed0f86e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The PDF structure and embedded links suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://tiwtactic.com/userfiles/files/72407423334.pdf In PDF document text
    • https://tedvandergulik.nl/userimages/file/19540224379.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/wavenovomidikosif.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/polifikuvebobazewasivifo.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/zipujuzorumimat.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/nusoveb.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/20547927865.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/pipamojokuwotuj.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/lapipasulifexexe.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427213825df---46697557926.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/joxuwipefurikapojokivafa.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/xebemoxivarubeluxabisi.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/44182028822.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/51179395139.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16147e89e691ea---86621485263.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0419339001631400672.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/98435945387.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/35695015535.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/9517540490.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/34440764645.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/64365427874.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/15919579429.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407e6408712---fezepusonarufonumazadaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mmorpg+mais+jogado+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_off0000b2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE2 17740 bytes
SHA-256: 15b8e98f314ba100509d73b3a5446bee84d5071f97d6293b17d3b4b0169e1798
font_02_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 10584 bytes
SHA-256: 7cd30b15b44bb91b8e29967631b9446af27fb88844036cf02e790e8c332680d3

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