Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef477a4b0d4a4c63…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 05:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef506d822d9c4b4963cb122d4915215e SHA-1: 30782039a19ac0ffee5aa228cca7c6c7a3742c97 SHA-256: ef477a4b0d4a4c6379e3ac0d1cadea253f3abca27dd5e7b4638045f109c98325
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm and potentially phishing/malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=ios+android+developer PDF link annotation
    • http://paliukenas.lt/i/File/tisuwododabakavanasal.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/34499871248.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/76732937949.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/lalexulited.pdfIn PDF document text
    • http://hanyangsteel.com/files/fckeditor/file/740351148613a84384fa6c.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/fesim.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/gojogiwokata.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/kiperagazibow.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/fimut.pdfIn PDF document text
    • https://blugarden.eu/file/30383283594.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/xisivogodux.pdfIn PDF document text
    • https://unitjaya.com/contents/files/kofefozebuninufe.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/sajuxapijepupuvekusuveziz.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/27185909359.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/galulusepavo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7be0f903---30506436598.pdfIn PDF document text
    • http://surausa.com/uploads/files/nenejo.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/29005948234.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/5539107137.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/zefudaxoxema.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/roborepekuxideven.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210913115605_484204258.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_off0000c185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD997 16568 bytes
SHA-256: e1814b318556ecb5d6c1e03d8eecf2e5435efa358b5b1e5573a78cb3f8f226a3
font_02_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 10304 bytes
SHA-256: 409e95030f97b28c4ccc619aee6777b6bb8d8a66b36318d9f963043846098a2e

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