Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7ef81649b90b21…

MALICIOUS

PDF

73.6 KB Created: 2021-09-23 03:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32ab959d4d707b3b59dc3a045af64f2b SHA-1: 95b412fddd23f8eca42694100b4c388704e68194 SHA-256: fc7ef81649b90b21ac75d6a9fe36c51d2e29b5834dc4830aee7eb9b501515776
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to potentially harmful sites or for SEO manipulation. No scripts were extracted, and the document body was unreadable, but the high number of external links and the link farm heuristic are sufficient indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://xistenze.nagydavid.com/files/files/sevakidatiwexezifokurobiz.pdf In PDF document text
    • http://mrukseo.pl/userfiles/file/83653227733.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/8294878003.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/48926700006.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109042027401123.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/roladenek.pdfIn PDF document text
    • http://ave-france.com/pics/files/64218301578.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/90388158029.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16146608c6c930---lalejeladujuva.pdfIn PDF document text
    • http://lachina.cn/upload/file/jabipop.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/60079045220.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/15087875335.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/kawemakibizipapamugokap.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/pivefoneludewomezufuf.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090701490077.pdfIn PDF document text
    • http://www.depomatrial.com/file/lomutawoguzuse.pdfIn PDF document text
    • http://perksys.com/userfiles/file/dizisokanovolonibabakono.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/26691997751.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/17600764565.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/xabavugotogipojig.pdfIn PDF document text
    • http://agro-partner.com/Image/files/48016480651.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/xexelatolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+live+stream+sitesPDF 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_off0000bded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDED 17336 bytes
SHA-256: c2d24559ee3a31e895d09c7d5ecd08b6b47be3e37060c804e1f4c348f324cb9f
font_01_sfnt_off0000e9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 10164 bytes
SHA-256: ec773c988899d9d74808bd0d64033aa17f2f0e7b7c2675a44297613af7f70d26

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