Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf2c12bc20b6007…

MALICIOUS

PDF

69.4 KB Created: 2021-09-14 04:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 1f1f2d6265a6bc8270cc6e1019b603f5 SHA-1: 4f5983ee62ebf5264b818da0399711cb69f30099 SHA-256: 9cf2c12bc20b60073ea43f0d88c350bdf9884d779e4e4948dbc7060ed92d7d28
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=clash+of+clans+unblocked+hacked PDF link annotation
    • https://empezo.xyz/js/ckfinder/userfiles/files/gurezagoruw.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/36527026104.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/44344038260.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/13229658716.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/57822054156.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/lunij.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/26179574515.pdfIn PDF document text
    • http://ch-yang.com/upload/files/zowuziwarolewufagurunowat.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/rezenopusebep.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/bufabarositenapelapo.pdfIn PDF document text
    • https://km2804.com/ckupload/files/14641079998.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/welesufiw.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/76552413579.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/jonototukujiz.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/rukapawekogekemoxekuwuna.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/pigosuzofawogunedo.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/19842148475.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/zadoguja.pdfIn PDF document text
    • http://szjg.hu/images/file/nuwufevoroserulite.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/57403077248.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/59665176480.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_off0000b000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC817 10648 bytes
SHA-256: d936ad1cb36599499f291e01e801d501f382add8e135a6637f3cc5dbc65af70b
font_02_sfnt_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 15648 bytes
SHA-256: 05de92af3128a6f571b317bce2b357d1d1068bfc897583dbd8a528aef9a54c4c

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