Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed48177466633e5f…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 19:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 142dab269665e54d5285fe6983efd10a SHA-1: 34244adbddfe098bcb5a59f7d8949b319caa0f1c SHA-256: ed48177466633e5fd75cf0376f5c013118b9a924942577b227edc41d8ccc8067
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The presence of numerous external URIs, many pointing to PDF files on distinct hosts, suggests a link farm or SEO abuse tactic. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://newgrids.com/userfiles/file/51277960103.pdf In PDF document text
    • http://younewstoday.com/task/userimages/file/jijufaxivu.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210918/16319458102893.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/filizuno.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210908031942.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/jiwelimatobitaxebul.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/67546728939.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/junog.pdfIn PDF document text
    • https://pecintajp.com/contents/files/48907422035.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/ketokek.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161354eab33ce8---botezexepifuzar.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109030033584103.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/delezomulegoxodemet.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/1194239660.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/funeravinilit.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/51436748847.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/17140536695.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/bosarov.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/76271165150.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139dc17e3895---88214381258.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/65604271156.pdfIn PDF document text
    • http://baove24h.info/upload/files/72404257727.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/nutapejiximipojiripuge.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/98143622210.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/6565552214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=stick+war+legacy+mod+apk+iosPDF 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_off0000cb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 11120 bytes
SHA-256: a97054564c621896399e69e0c06a1b3e3db364f3d6c8cdb72b82bd87e87fe72f
font_02_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 18908 bytes
SHA-256: 2456ee6bd3de3ed99fd760089ca8d3a23022a7817dbfb5c4029022a83de8c58b