Malicious PDF — malware analysis report

Static analysis result for SHA-256 b175d6eea3a03c6a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-11 04:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1945cabb4b86585c11e34c8626d7f8cf SHA-1: 3c606bcb752142ff264ad3067cfff2405fe2a67a SHA-256: b175d6eea3a03c6ad5fc4be5b033bf70366fb182d717e2f394dd49badbf97529
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs pointing to external sites, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://ouhkpthaa.org/userfiles/fizunofiba.pdf
    • http://yongqingtech.com/d/files/vikisapomixijas.pdf
    • http://indagosrl.it/userfiles/files/60384782889.pdf
    • https://olivier-daulte.com/ckfinder/userfiles/files/5338683480.pdf
    • https://terrebleue.org/userfiles/file/67406140673.pdf
    • http://kunmobile.vn/files/uploaded/20210909/file/busovazilo.pdf
    • https://nidi.mk/ckfinder/userfiles/files/12336678523.pdf
    • https://bandotrading.com/uploads/file/kivodimigeledilowiw.pdf
    • http://sbsinternationalschool.org/userfiles/file/92381455469.pdf
    • http://shangrilatheshow.com/ckfinder/userfiles/files/vemowolavimawiradasedoja.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfe47f8b4---kedofopaziw.pdf
    • http://lsneotek.com/ckupload/files/winasiwawerotaweguvi.pdf
    • https://halkapsikoloji.net/userfiles/file/17324534626.pdf
    • http://redeyeldn.com/userfiles/file/84783708130.pdf
    • https://www.eos.org.eg/ckfinder/userfiles/files/situteligutewuwabodipovu.pdf
    • https://rajatotogroup2.com/contents/files/kavurikifetotebugezota.pdf
    • https://rheinfurth.de/userfiles/file/mivurenagukabegumure.pdf
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/doduzemetutujurozutur.pdf
    • https://nic-irq.com/userfiles/files/86529363060.pdf
    • http://0975811252cool.linker.tw/files/rofuwulazugimejowe.pdf
    • https://grandhotelbulgaria.com/userfiles/file/gojelitizu.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/0f0fq9rho700aqcii6oti04bb1/26475184471.pdf
    • http://stonestudio.pl/files/upload/file/59983553955.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=what+to+do+with+chicken+eggs+in+minecraft
    • 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_off0000d16c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD16C 16792 bytes
font_01_sfnt_off0000e983.bin
ae644c4da0a75c1667658cefdd4838e9ab7e4be2d30e43209a02bf4e2f029904		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE983 11048 bytes
font_02_sfnt_off000102ec.bin
504bb8c45d092984699adc44d5641483ebfdc7494bea45c8186a542f5fc880b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 17896 bytes

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