Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c33bb666a44ba89…

MALICIOUS

PDF

73.0 KB Created: 2021-09-16 05:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1a7be31c9b94ca7e1b61b094e829a2d4 SHA-1: d6bf79066880c360eb0a954a9ad783ca9b5bc1b9 SHA-256: 0c33bb666a44ba899b2878de013a5eae2ed02f60dffdc4f2fbf54825b1aee694
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 0.9956

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://synerhu.ru/uplcv?utm_term=code+minty+pickaxe PDF link annotation
    • https://processwork.archerhuang.com/ConImg/files/sakupawawexenawotiboru.pdfIn PDF document text
    • http://rayer.cn/d/files/98636638853.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/27247447319.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/80467577240.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/59310517860.pdfIn PDF document text
    • http://lobi.md/userfiles/file/2229654961.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/68484322507.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16311172771431.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/63782065996.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/6657910235.pdfIn PDF document text
    • https://renetravel.ro/images/files/jonunikerowig.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/fagenisagawuk.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396fc759c37---nudejolukokabuku.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138c9a4e9697---91077245742.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/24349337853.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/verijefazebejodenulita.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/85388348278.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/loveromadakazed.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/duterizovuwux.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/noberivuzoramisovi.pdfIn PDF document text
    • http://bjjiffy.com/upload/88414429384.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/55136143273.pdfIn PDF document text
    • http://anninh247.info/upload/files/fudoleliluxojimapapura.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_off0000bac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC6 16700 bytes
SHA-256: b65548bb81b1faa4b13ce66770f270d104309cb4096682ec6ee2fbbd7eaf4064
font_01_sfnt_off0000e647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE647 10700 bytes
SHA-256: 76e7c8a668eea3157e8d19e4e1c18b1ce8ff7ba43d3af4ef3f92c9d2991e50bf
font_02_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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