Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d4a81b47d301de…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 08:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e0036563ef3bbdb3e32c80446701649 SHA-1: 398ca00442501de3ffd253fa71c6fa943da8cd29 SHA-256: 96d4a81b47d301de49d456b9a899f83a72da1f1a3b0eae70260681054c6311e9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs, such as the one found on 'whereestar.com', are likely part of this lure to trick users into downloading malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://whereestar.com/marinarubicon/admin/file/91291948828.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8d89b2d35---11778353012.pdf
    • https://cnn-logistics.com/asset/files/5277513006.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/80404557918.pdf
    • https://thehouseproduction.net/file/26099840973.pdf
    • http://vektorma.ru/uploads/assets/file/zokogumutaw.pdf
    • https://globalmediaminds.com/uploads/files/54755422093.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/zanuvujinozesexejokixu.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/pusugov.pdf
    • http://hc6999.com/userfiles/files/43082409001.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/30361072124.pdf
    • https://zakarpattya-tour.com/upload/1721760708.pdf
    • http://reylab.com/userfiles/file/46646138231.pdf
    • https://nhahangphongcanh.com/uploads/files/zemizapodeji.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/12502913877.pdf
    • http://gsprojekt.eu/userfiles/files/97913147140.pdf
    • https://pt2-turbo-j3t.com/contents/files/54764727421.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613565735c1f1---77832192775.pdf
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/8092095379.pdf
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/30583224095.pdf
    • http://ogledalata.bg/uploads/pages/files/47527780360.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210902_42733D6F0BCC1C48.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16136c765607e5---padimujed.pdf
    • http://quincy.pl/ckfinder/userfiles/files/48948687762.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+windows+10+chromebook
    • 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_off0000da73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 16792 bytes
font_01_sfnt_off0000f28a.bin
6d1f3eb6e2ef4745edb8745bc51694402fe30213a526832e9088f907968ccf11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 11032 bytes
font_02_sfnt_off00010c02.bin
1a0597e2d1664ba2a2466260b8581cb572ded0e58e25d5682e20bd4315696802		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C02 17148 bytes

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