Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e7d809b37cdb24…

MALICIOUS

PDF

95.0 KB Created: 2021-09-08 19:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a6981734aa47b676384fbacccc063150 SHA-1: ac9950493e936e0d30ede10dea02c9470bc86d4e SHA-256: 63e7d809b37cdb245afb308bf4f30100ffdbddfd4e0f906b02a17ea5459f0eb8
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://chcial.ru/uplcv?utm_term=ganden+mahamudra+pdf PDF link annotation
    • http://santamariamikado.com/uploads/files/62446885900.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/62663340386.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/69486489742.pdfIn PDF document text
    • http://goref.ru/files/file/sosinavesinatimitetazor.pdfIn PDF document text
    • http://synergyproperty.com/images/files/kitun.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/83385714573.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/80541050408.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/subesewuw.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/tomenuzimodexetegatogexu.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/97995112256.pdfIn PDF document text
    • http://abpaluso.com/upload/file/3680810153.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/139930500.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/wufixurawawevat.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/siferogamobiwa.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/93294959998.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109010855265611.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/korinegebazazenu.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/22109532525.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/66352847557.pdfIn PDF document text
    • http://infunplastic.com/d/files/luruvu.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86ef8dca8---lafewovuxogoxugusinul.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/4271006966.pdfIn PDF document text
    • http://maihome.hu/admin1/file/37542566665.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/goturexiremevemijibibixu.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/lutabimav.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/78762352888.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385e0ca41c9---kujanuxovuraxovuvibagesa.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_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 20564 bytes
SHA-256: 238b5f0d7efc70cb2b0dddceff972db14fecac51277f8ecfa05a2550d8c6e9ee
font_01_sfnt_off00013f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4C 10376 bytes
SHA-256: dad0baabf4f94be2d19116a2d9711c91bd44a4dd70733968cf41203628a05394
font_02_sfnt_off0001567b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1567B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1