Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e2918d1a99a0bc…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 02:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5948eedadbb2be08b25dfecda2d7c474 SHA-1: f6ba6c793c90a6dc656524b786e19d25d66b4336 SHA-256: 24e2918d1a99a0bc54df44dc34c1a853b1d7a90a5ef06a6011822d10bac7a69c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains, indicating a link farm designed to obscure the true malicious destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://hoangminhphatkorea.com/webroot/img/files/ruvadunotorozuzenim.pdf
    • https://zenithoverseas.com/assets/userfiles/files/68091120135.pdf
    • http://shriramashramssschool.org/userfiles/file/96238585258.pdf
    • http://kimsanghun.com/upload/userfiles/file/20219132232393946.pdf
    • http://bluecreator.biz/ckfinder/userfiles/files/93101573679.pdf
    • https://selispin.com/calisma2/files/uploads/xatosometikugodobik.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/72275987466.pdf
    • http://yacpa.org/yacpafiles/file/64984694220.pdf
    • http://chaodontuonglai.vn/uploads/ck_upload/files/5524777154.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/75310323412.pdf
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/57728966957.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210911_C8CFCD8E7FB1C3E2.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/36339906684.pdf
    • http://transchem-tech.com/Uploadfiles/files/wobowivininitilag.pdf
    • http://flex-link.cn/uploadfiles/files/xelepaxutifubi.pdf
    • http://ventilatoryzlin.cz/images/file/takesemokutu.pdf
    • http://magendans.com/imagefiles/file/87503940555.pdf
    • http://fitviewer.de/files/file/44457332517.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=example+of+explanation+text+type
    • 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_off0000dc3c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3C 16792 bytes
font_01_sfnt_off0000f453.bin
661cdff5f186332352d525abe19316c63afdcb32bba08769c162bf89bf69c9ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 10448 bytes
font_02_sfnt_off00010c03.bin
1e94c58f3846b70797cdb1baf6e6912a20df82b1222baf2798a95b5433fc7b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 17964 bytes

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