Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0c8ac80dcea87a9…

MALICIOUS

PDF

79.0 KB Created: 2021-09-13 14:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a7abd99826fda19e229a6eff4e88e92 SHA-1: 9f66afe2f66089210d443c777afad06d7f63ca8e SHA-256: d0c8ac80dcea87a92794078975b4e348cd689f697b60c1777629a3317493375f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be directing users to a network of sites, likely for phishing or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://golden-candies.ru/webroot/files/files/9795647125.pdf In PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613043f0bf028---96333953381.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/lusexotugenelenexo.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/bubiforibul.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/55945108789.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/2711549404.pdfIn PDF document text
    • http://prestopc.it/upload/file/zovasabirakowosunipozupol.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/fisugel.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/dorumipirurafef.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210912112220725.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/55668644794.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/tafutikirudun.pdfIn PDF document text
    • http://rts-3.ru/upload/files/23982682229.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/66184227477.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/23042415089.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/jiwogoluvol.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/87980829462.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/38091710178.pdfIn PDF document text
    • http://medrea.ru/upload/files/92694200514.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/70447809064.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/60913973522.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb83fb607f---48980795323.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/86827715156.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/majojexezoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=sexy+words+that+start+with+dPDF 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_off0000cc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC73 19636 bytes
SHA-256: 01c925e3bca8a84d547652992760c7a01a68ac1e8eaf5301be5ff03a41873f02
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11686 10572 bytes
SHA-256: e0611503c0b45b25108bfd95464f8ba92ab439c513f29b567610e47245ed0d25