Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeca37ca34155cff…

MALICIOUS

PDF

68.3 KB Created: 2021-09-27 11:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5449e97ae700ca56cb3e325f6d0d5cc1 SHA-1: d1a3021b6278bc1026d36e64639cd63db60ee693 SHA-256: eeca37ca34155cfffc981ef1e5d5a0ce150d351717b200163462ee9f493d90f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically attempting to trick users into downloading software. The presence of external URIs and link farm characteristics further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7691

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crysiq.ru/uplcv?utm_term=wcc2+download+for+pc+windows+7 PDF link annotation
    • http://photo-ostrov.com/ckfinder/userfiles/files/29433026439.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161387607cc4d7---57645923530.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/bepimovemujufuxowugaj.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/losaxerujuzaxadawuvozeg.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/zugasiwowe.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/xelut.pdfIn PDF document text
    • https://sledovani.gpshlidac.cz/www/userfiles/files/rexurupaturugobukalera.pdfIn PDF document text
    • http://industra.sk/userfiles/file/13675868552.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/lezeje.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/kunimowomaseda.pdfIn PDF document text
    • https://baongochoa.com/upload/file/tomezaz.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210902231508_482295.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/magoluzogidexuporekoxevo.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/97201243997.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/87375679409.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/namefa.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/vamutuxilevaxerup.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615159e641b02---jobagakunugariruketim.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/2742310082.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/mefevode.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/fifivuwiroke.pdfIn PDF document text
    • https://krossi.ru/images/content/files/695679592.pdfIn 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_off0000b230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB230 17416 bytes
SHA-256: 09ea3c2a217d66943f292989bf8f00ff909f92567cf637ca39f23676c1365349
font_01_sfnt_off0000df2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2C 10632 bytes
SHA-256: 90a0665d65c21ac97d069667a9070b56fc075bac5e4c03fa7182be8824ecbbc5
font_02_sfnt_off0000f7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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