Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0517438634e9c4…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 06:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ca399fe8146aee13fb69f872bd928c2 SHA-1: a0862b93ab97e56c009bf51e87b35c8949c50624 SHA-256: 2c0517438634e9c47b4702a6c138bdbdaa31932939a1f619f0bba1adf6e80245
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains and forming a link farm, suggests a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a tactic of using numerous small, distinct domains to host links, likely to obscure the true malicious destination or evade detection. The document's structure and the URLs extracted indicate it serves as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=how+to+create+hotspot+on+android PDF link annotation
    • https://5a.ro/ckfinder/userfiles/files/dajomojukibafejuz.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/86699375674.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nowepadimusoxujifabe.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/54569235814.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309eb87b2dc---susese.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/bajexosaxogewodo.pdfIn PDF document text
    • https://semut73.com/contents/files/48905193992.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/87167942905.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/tomunojokisotal.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/53707856855.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/xikojetemefomaneped.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/jerixavuwuma.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/xolofexaberaxozawuwujexo.pdfIn PDF document text
    • http://christopherdallo.com/file/ziwabipubitijapupexe.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210908_220352.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/95629226039.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13318637579.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/27042981046.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/jozasulanid.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/46880209572.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ce712ff0712603626f587e9f25a223c8/tolezusafanarabumiw.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/migisafifut.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/26484987024.pdfIn PDF document text
    • http://poliinc.com/upload/files/turoxafetiserok.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_off0000df6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6E 17680 bytes
SHA-256: 81093a37d6a30632fc2bf9dffaf1065320751f145dbcc3cdcfbe37017d8c4648
font_01_sfnt_off00010d7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 10644 bytes
SHA-256: 1c9fbb2ec05e3f57deada65f5641bd0b9b286d0587b4df238056e51490459114