Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf7f2b4f5022944…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 19:26:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 95d4151ba882321be11b2ad63c85ba34 SHA-1: 558a1e4b15680807b20fecce752dd1ebb1799ab1 SHA-256: baf7f2b4f50229446152bfe3d87b2d4609bb35059e8571c1634423a51ef7d2a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful content. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=vidmate+apps+download+2021 PDF link annotation
    • https://cahayaapi1.com/contents/files/pimonupedosagoriwig.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/79090936616.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/37677738231.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/kefeduzoxixepanelanabe.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/zitew.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210910_8825762CEC67ECC3.pdfIn PDF document text
    • http://plise.org/userfiles/file/55660191726.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/vonemetawulogerexobaba.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/54904880323.pdfIn PDF document text
    • http://gibisch.org/files/files/14643064194.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/kufefe.pdfIn PDF document text
    • http://school15-tyumen.ru/f/94725241465.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/mudetof.pdfIn PDF document text
    • http://hongdacable.com/d/files/59873193109.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/sosatosidajel.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/ruwar.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/43242656135.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fee3a4bc---tiwoxatoduzigug.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/60418664741.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/67182682263.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/80522000294.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161357c8273f3d---2376084008.pdfIn PDF document text
    • http://tochuchoinghi.org/files/80142319510.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pukor.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_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 10804 bytes
SHA-256: a33baca3f04379a5d30cf963da452a29184fc4b020e6658e38c309520763a16b
font_01_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 17700 bytes
SHA-256: fb62a26be2f146b57a43452e407d0a3d44900f5bfe6d98f83371242f1ddf0f9d