Malicious PDF — malware analysis report

Static analysis result for SHA-256 43195afc65090c61…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 02:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f0cad5004ffe2973df810f58e80c42b SHA-1: 6d70f9f88df7aa0e20a22ee3ea569e3efdca24b0 SHA-256: 43195afc65090c6120b305da5e85864a25bdf62d9389eb59fa440ea7df230a8a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://micronforgacsolo.hu/UserFiles/file/supunuvuwogevugaxasiwo.pdf
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/bujaxoferogetamega.pdf
    • https://zenit-npk.ru/files/file/80453283759.pdf
    • http://abpjse.news-read.com/upload/files/noberukezavojubejawixo.pdf
    • http://holland-ex.com/images/blog/file/48186009122.pdf
    • http://gmkms.net/upfile_editor/2021/files/fozopevifewul.pdf
    • https://vcubusinesssolutions.com/userfiles/file/33051579395.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea42b701a3---zorosakeb.pdf
    • http://ozkayalarlojistik.com/userfiles/file/wajopenurijelepude.pdf
    • http://miet-boot.ch/images/uploadedimages/file/11272706889.pdf
    • http://hk888.edo2008.com/com/comimg/file/20210920_193949_161.pdf
    • http://1-sanya.com/blog_images/blog_/file/folopenonosepuvutafoga.pdf
    • http://tpt.taipei/asset/uploads/files/20921740217.pdf
    • https://maxflowfans.com/userfiles/file/xafibowuxajovanuka.pdf
    • https://www.mds-horizons.com/upload/files/33298061866.pdf
    • https://liur-krd.ru/userfiles/file/wugonebafigeroxowafesifes.pdf
    • http://tsuiteru66.com/userfiles/file/turarujoloraxavowiketo.pdf
    • http://pokrowce-ochronne.pl/Upload/file/1589201497.pdf
    • https://mtydizayn.com/userfiles/file/5915331798.pdf
    • http://one9five.com/userfiles/files/gaputezuxe.pdf
    • https://eledigitalpr.it/allegati/file/xusoxuxugefomoboze.pdf
    • https://navliecky.net/userfiles/file/pigafulevojoza.pdf
    • http://asremajazi.com/uploads/files/pubemafip.pdf
    • http://noithattamphuong.com/upload/files/lasedunonen.pdf
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/52755172917.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lords+mobile+free+gems+hack
    • 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_off0000aecd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAECD 16792 bytes
font_01_sfnt_off0000c6e4.bin
e62bbbcc24f65164c1759ccecb6d6459644b3c9be6689cb348b8be001eb57522		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E4 10912 bytes
font_02_sfnt_off0000dfe2.bin
9bcc8fc9928ed6a9e2667f6bd5f1fb8a1206ed6e3858daa665047320ff1113f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 15128 bytes

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