Malicious PDF — malware analysis report

Static analysis result for SHA-256 927b73629f3f84e2…

MALICIOUS

PDF

76.3 KB Created: 2021-09-11 10:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 298e6347cb1f9fa7c739b8e243096301 SHA-1: 37287c96f33926b605522be5392f1aef39d73884 SHA-256: 927b73629f3f84e2bcac2cd3d15e90a0fb70c6fa041aa22e56bfa71543dde7ad
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://hzxf.com/images/upload/File/tobafepa.pdf In PDF document text
    • https://megacook.pt/site/upload/file/lukerasolafofufuva.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/7878904166.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/fulexidipuduvo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/xuwofonegawifowipedofare.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/vetijo.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/14346840424.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/lodowar.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/leperozufosubu.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/kazefabe.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392c8d6c554---negekudima.pdfIn PDF document text
    • http://rsentco.com/upload/file/90699158215.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210906_030901.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/jerabaxigu.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/vawaxi.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/18010583579.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/sorutevepo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/htm97dg7sbfjs3d4jnjte9tkgg/53480805189.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/kobowelowazakawiri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bad+time+trio+simulator+onlinePDF link annotation
    • 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_off0000ce08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE08 17420 bytes
SHA-256: 69ee1290be519d4efcda02023984093d577a25f45614000c26d5248fbdffe0c9
font_01_sfnt_off0000faee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 10560 bytes
SHA-256: e698f29e3c2864c2409912e2f36e4468805c700d5ff8b4dbe7188ee590c429bc
font_02_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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