Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9324f267aad450b…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 22:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0faf31cfaf02be7c85a7460774909c4b SHA-1: 3d4a6e0cb4dd851a5cdb6140d1dcb9e3d5d6a28f SHA-256: c9324f267aad450b65fee7ee0092d300be3ea63e4ca559d1bd5b09d274743791
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting it acts as a lure or dropper. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.skk.com.hk/admin/ckfinder/userfiles/files/76796843786.pdf In PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/16658483107.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/wesomibutusubowurumitino.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/50894366853.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137957399d8c---19096937578.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/30442322769.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/ketamemupogalokekisika.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/pedufumewozulofubafuv.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/35516770235.pdfIn PDF document text
    • http://dakmet.pl/upload/jarozoxeviwo.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/sigapidimiwagudakudetiza.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/xasumami.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/87990755297.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/53613598431.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/20663260191.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/53497745152.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/19843000375.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/99764145073.pdfIn PDF document text
    • http://ctm.it/userfiles/file/kirixodagiropudibura.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/22030466667.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210906071956.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/wojafifemetumitisezuwu.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/586775160.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2542eb3a88dcb5232c6b12db6e013767/puritedeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=black+clover+apkPDF link annotation
    • 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_off0000d79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 10116 bytes
SHA-256: 3ba0f7c81e29e1cf9ac82e2534cd717dbb3fd2bb52e1373b12b02bbe569c6539
font_02_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 22068 bytes
SHA-256: 8910d4e8e89dd19c717a6a36fb37a1d4e3ce7afbbe56d8f3d9e522bcc3dc8ce8

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