Malicious PDF — malware analysis report

Static analysis result for SHA-256 9036bbb07b6e418e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-11 07:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9aceb0a595a378630cf9aa4b0f70509 SHA-1: 7183929985d34064a4d2b1952e4b0147a73d3750 SHA-256: 9036bbb07b6e418e9cbd27c4484179596399b54dbd6ab466b55aa699055ec030
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic, combined with numerous embedded URLs pointing to PDF files on various domains, suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ibliberia.com/ckfinder/userfiles/files/gakijalo.pdf
    • http://lscapital.it/images/file/65443101277.pdf
    • https://uleshuzataruhaz.hu/files/file/dokutifijajiliwulemixa.pdf
    • http://nationalcoopadvisors.com/userfiles/files/25705727911.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137df6323d98---89378628644.pdf
    • http://www.bandungmesin.com/file/17697063169.pdf
    • http://palaciodelosnavas.com/userfiles/file/33629768293.pdf
    • http://www.cafeinca.com/img/public/contenido/file/23660082602.pdf
    • https://mbzl-pro.xyz/web/img/podborky/files/89581536054.pdf
    • https://astdubai.co/userfiles/files/damafizadaworadefivekuti.pdf
    • https://pfollowers.com/ci/userfiles/files/75106106111.pdf
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/1131826263.pdf
    • http://caerulumpharma.com/upload/files/talebavir.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/dogovipavosuloxome.pdf
    • http://hongdacable.com/d/files/16271834401.pdf
    • http://lamekatus.com/uploads/ckeditor/files/gubipezotifuj.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161311dbf6ed78---62128630230.pdf
    • http://spokoino.ru/i/upload/files/29194525678.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/46803712072.pdf
    • http://pijntherapie.be/uploads/files/88068080349.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=apollo247+app+apk
    • 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_off0000db35.bin
30325c239157ed91bb0c4e56d96bca443123e6c9bc41ee02a16850538f089bb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB35 18932 bytes
font_01_sfnt_off00010c87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 16792 bytes
font_02_sfnt_off0001249d.bin
9b6a2f6a0ae44ff41ca928f5fa70ec4c7bfc904168ebe7941ecdcf7fbf739b2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 9872 bytes

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