Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdc94467b06eefc…

MALICIOUS

PDF

72.9 KB Created: 2021-09-20 00:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 423ba655533ff6ba738887bed1f9b186 SHA-1: a8baca43228ae0b262dc4ab72abab648aaae4088 SHA-256: dcdc94467b06eefc1954d195b4610d80592b341fd1d04b03edc298a5748e5fb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's designed as a link farm, likely to redirect users to malicious sites. The embedded URLs, such as https://catamma.ru/uplcv?utm_term=freedi+youtube+downloader, reinforce this by pointing to potentially harmful domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=freedi+youtube+downloader PDF link annotation
    • http://biswasi.com/userfiles/files/85180514889.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/basajojezibugokasofagumof.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/kegozuwijowipofare.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/xipimosawuguzosiwesudijok.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/79d5d91aa444b1f0df2cdf36357f6bec/pizomabi.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/15889045632.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091400334425.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/96075181059.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/gawewovirijefobi.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/27527424472.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/lesevujef.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8922dd0e7---33679655444.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/57478329816.pdfIn PDF document text
    • http://sofar-france.com/userfiles/file/51298908660.pdfIn PDF document text
    • http://lblussana.it/images/file/24788723854.pdfIn PDF document text
    • http://besteva.com/upload/files/pagiwisivisijofetumema.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/bamapoku.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/jifoxito.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/80353721769.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-7/20210907060010708753.pdfIn PDF document text
    • http://bwc.lt/i/49596454384.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/36688593269.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/pujezokemirigagefub.pdfIn PDF document text
    • https://cooperspick.com/files/rofimubisenorowexijewer.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_off0000b884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB884 10492 bytes
SHA-256: a569acc29291521e24f67489308259bb8cc88589fc18420464c8e3aca7ff2805
font_01_sfnt_off0000d083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 17420 bytes
SHA-256: aed483089404bcb48a075c2ad3d0860ee8374c288e986c2f3431bc3fdc630d97

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