Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c589ee3cff3b258…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 21:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 107729a8da6dc1a0b93f37b56887436f SHA-1: 1439340bf1c117f87cbc2a8bd81b344d3b2f07a5 SHA-256: 8c589ee3cff3b2580b709f9043bf0554ed153827810245023ced618bd59a002b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://medvor.ru/uplcv?utm_term=locku+random+video+call
    • http://hzqzg.com/d/files/mugezapexagowanux.pdf
    • https://sakura-bashi.com/uploads/files/202109121846233628.pdf
    • http://mercuresamuichaweng.com/admin/file/pazenubadoniwujelerubugik.pdf
    • http://restauraceeverest.cz/userfiles/file/60979023184.pdf
    • https://ganport.pl/userfiles/file/93092068368.pdf
    • https://uzmanwebci.com/calisma2/files/uploads/56205037545.pdf
    • http://drumlockingclamp.com/FCK_Editor_Images/files/zikinunak.pdf
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/semitozagubi.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/dujevigupim.pdf
    • https://festacontinua.it/public/file/78622612908.pdf
    • http://elektrostroy.kz/ckfinder/userfiles/files/73959171295.pdf
    • https://underworldgear.com/upload/users/files/lokosipa.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/6d717rv2hfk1qbp4fbipf7aegq/58697521056.pdf
    • https://dafelia.com/files/liwuzo.pdf
    • https://bedandbreakfastholten.nl/userfiles/file/21396681062.pdf
    • http://ziconiavip.com/uploadfck/file/kupalonutugegewedolopup.pdf
    • http://aranykoronakft.hu/userfiles/file/58436374899.pdf
    • http://positiveforce.in/uploads/files/mipasa.pdf
    • http://lamexmarket.com/uploads/files/92060781344.pdf
    • https://netwindowvn.com/uploads/userfiles/file/gepivusa.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130305b04f29---digazaxexot.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/jevidof.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 16792 bytes
font_01_sfnt_off0000fadf.bin
a8aa681d2e2c932e53b2565be37bd02714ec6e35a614b7a3a5be567778a85f90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 10480 bytes
font_02_sfnt_off0001129d.bin
63f9d36771561dc4d005b187a8cd805605a23679b9de5db3367770388a3e8ee8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 18160 bytes

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