Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd49ccbd44a630c…

MALICIOUS

PDF

71.4 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: 8225c03624f5184c21bb685b8ec14c65 SHA-1: 82682a357d4dbdacb9c2bdd7b93cde8b7170d497 SHA-256: fcd49ccbd44a630c9aae142c99b273d33c001959a307b67e1f2f85c07a992bb4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. One prominent URL, 'https://crysiq.ru/uplcv?utm_term=wcc2+download+for+pc+windows+7', indicates a lure related to software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • 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://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://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_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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