Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c487a569c1500f4…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 15:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8aa97b7892314382215f018a222c27f1 SHA-1: a261fe0e61589e512f820a6fe09186eadad674e9 SHA-256: 2c487a569c1500f47931eb6a0cf422cfd5245f0beefb71728763618697a04e03
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially malicious domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links on disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cmuniontravel.com/userfiles/files/52462166496.pdf
    • https://empresa-venta.hr/files/11343951517.pdf
    • https://on-call-anatomist.org/ckfinder/userfiles/files/zosizepebolovigena.pdf
    • http://arcomproltd.com/userfiles/file/jupasoxamataj.pdf
    • https://kaparatt.com/images/File/99786895493.pdf
    • http://thietbimaugiao.vn/Images_upload/files/vumawitukoxuji.pdf
    • http://lecostationery.com/files/file/kiximatorovugetixepis.pdf
    • http://abwgulfport.com/uploads/files/35774675547.pdf
    • https://santa.sg/images/users/00000000/files/98305824613.pdf
    • https://easternresources.net/ckfinder/userfiles/files/wumokexomavoziwe.pdf
    • https://horgaszvelem.hu/ckfinder/userfiles/files/dafatuxizadudajobemi.pdf
    • http://chiari-web.com/ckfinder/optimist/files/wusikurosexejezuminad.pdf
    • http://tuzy.pl/Upload/file/kodibosunagugejufetuxede.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75d9cebde---zedozuf.pdf
    • http://kayapalinakliyat.net/file/pesizi.pdf
    • https://fenixfalt.com/userfiles/file/faxezidoluxatirixezejebat.pdf
    • http://taketty.xyz/js/ckfinder/userfiles/files/80117463992.pdf
    • http://naturalfurnish.com/userfiles/file/71324406220.pdf
    • http://siblom.ru/files/upload/file/masutagedo.pdf
    • https://transturist.ba/ckeditor/ckfinder/files/files/xolowifamew.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=solution+of+quadratic+equation+by+completing+the+square
    • 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_off0000cab0.bin
ccaf22a20acca8d29627136aebf1f6373a5c38e0b0c7f69b5d49671c5275a451		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB0 17304 bytes
font_01_sfnt_off0000f7e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E4 16792 bytes
font_02_sfnt_off00010ffb.bin
b4076c50e979516b00846401cee533520958aac7e16a4d0fc976ed12a844a9f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 11640 bytes

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