Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcd3806fba4e3c1…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 08:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b07359c144eb83ada8889bd7b56af85 SHA-1: bf301f369ea189eafcbe75cb1017782c65806f93 SHA-256: 5bcd3806fba4e3c11a697207cedda7ad7e9c1973bd249474fd24ab86ec90d1f8
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains, many of which appear to be disposable or low-reputation. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://birizgardenhotel.com/userfiles/file/2242400488.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6e7b4bc4c---rademiwu.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109072356444730.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210910_3A51EF061A351F16.pdfIn PDF document text
    • http://podarox.ru/public/files/21766161771.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/b9a34afa62ec69e96d951ba1e604883d/63873991597.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/81484407906.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/72218151948.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/16378685290.pdfIn PDF document text
    • http://uhorder.com/upload/files/wifuponetapawex.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090503033161.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/59139064095.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/falapejujelijisemapinonu.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/rinoposenusefojelezipepi.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/zugejo.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/75802637825.pdfIn PDF document text
    • http://neteyes.eu/editor_up/1265747027.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/xipelijidozonajixujome.pdfIn PDF document text
    • http://myredm.ru/uploads/file/14421951151.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/77004286772.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/rusisejuvorafitupomufisap.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/15703360126.pdfIn PDF document text
    • https://menu2uplus.com/images/file/tukus.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/gupikarawuwiladixuwezowiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=introduction+to+algorithms+3rd+edition+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_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 11288 bytes
SHA-256: 0274e424efe059cbae7f9856307e294abd982a3c7784df0aad31922186cb42b5
font_01_sfnt_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 20396 bytes
SHA-256: a4c337ead8f6392c80aada77f64692be875514bf6bf1adad790d6a3a498b6d47

Open this report in the interactive analyzer, or submit your own file for analysis.