Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e2b7c368234336…

MALICIOUS

PDF

86.5 KB Created: 2021-09-20 04:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9129bc9e9d7af11435fe3be35ba9d5e SHA-1: 2bf7ce5eb6a90058aaba2e8fb4d34b149e416eb9 SHA-256: 03e2b7c3682343366b996b619bfd8b9cd8e9b413355482f1dc80585fd0aeb8be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm with numerous disposable URLs, suggesting an attempt to direct users to malicious content. The document body was heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tochalco.com/uploads/files/87082177740.pdf
    • http://consorzio-csa.it/userfiles/files/29803155210.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/wenosepox.pdf
    • http://yacpa.org/yacpafiles/file/mivenusu.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/87679289237.pdf
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/xubazonedijedukunuvetive.pdf
    • http://innovad-ltd.com/userfiles/file/lipetilul.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614039228fd15---83142063699.pdf
    • http://elesi.eu/fichiers/files/92979246983.pdf
    • https://harmony-lazienka.pl/Upload/file/wimuwefuku.pdf
    • https://traffictkt.com/viking1/uploads/files/86661013419.pdf
    • https://vroa.pl/chplusfiles/file/telixovez.pdf
    • http://voszveszprem.hu/_user/file/2343395258.pdf
    • http://romangruszecki.com/uploaded/file/jezipijadavumefosemokuso.pdf
    • https://budapestpainter.hu/ckfinder/userfiles/files/tasedonowemibaka.pdf
    • http://captaincook.hu/userfiles/file/62118552982.pdf
    • https://27061010.com/uploads/files/202109171632544359.pdf
    • http://sentezetutmerkezi.com/upload/ckfinder/files/zofoxowudobukedenarisa.pdf
    • https://rewaqousha.net/userfiles/files/xawakevibolavuf.pdf
    • http://belean.pl/userfiles/file/47994721791.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144401d3e96d---14896064610.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=laravel+rest+api
    • 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_off0000ed8c.bin
af269530daa800c672354b59bac7f20e72c2c1b2fd9099b9d597021abae7783d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 18596 bytes
font_01_sfnt_off00011e8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 16792 bytes
font_02_sfnt_off000136a1.bin
7a2e72176c5f9b42c10595d300c994b7d6aaf130fd4ed9003ea61b792cac0c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136A1 10044 bytes

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