Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7488e6468a061e…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 07:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bacf2cb902ad092319981962707f71ed SHA-1: 87652250c3f352d236f4cc5473fe327db5efc547 SHA-256: fc7488e6468a061ede6341afad73a82ade63cad112cc9039e82c5175d71bcaa3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm with numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=play+store+keeps+closing PDF link annotation
    • http://osteriadelcampanile.com/userfiles/files/44554763931.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/riziduwosebojet.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/13026206437.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/46353246969.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/97960534962.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cotttg4pv0kp9or07qhq0450fi/beboriruwipozuj.pdfIn PDF document text
    • http://artediapharma.com/upload/files/botodalokatugigolid.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/62787463485.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/57464303966.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/lumupoxabolitamiwukib.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210908_83EF5225085F3BDC.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/noxewo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/situpewodizurewodogewuj.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/68131810816.pdfIn PDF document text
    • http://360global.ca/userfiles/file/53884072832.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/zuwilatumefukifafixekajig.pdfIn PDF document text
    • http://sushi-belovo.ru/files/fagaj.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/xirizefosuxegus.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/98956801653.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/lanawipota.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nusuvij.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/37686128098.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161391150145ff---14092755390.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/37362830572.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/japitubetaragamafibade.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_off0000aff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF8 10756 bytes
SHA-256: 22d12179add0965a93246e727acaab767649e9d93cfd5afc442683513c7cca33
font_01_sfnt_off0000c8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE105 15264 bytes
SHA-256: 2176c4f55225c22a7dcf559ccc37296d1bd4cef887ddb5176f94965393e1816a

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