Malicious PDF — malware analysis report

Static analysis result for SHA-256 15a627a03733ecc4…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 21:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af38a5d4d2e98883db7161e033fb6cf5 SHA-1: b2bf00010c555ba76960e23fe4e392e09a721cf7 SHA-256: 15a627a03733ecc4bbe4bb8b1cdecab5c79d6b64ec0097e03ea43ad79dd4b107
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 high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host multiple links on disposable domains, likely to obscure the true destination or spread malicious content. While no scripts were extracted, the presence of numerous unknown URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nonbodepsg.com/uploads/files/96512661375.pdf
    • https://lazerom.pro/media/file/sorebiwa.pdf
    • https://perfecthospitals.org/ckfinder/userfiles/files/30164631226.pdf
    • http://chapelguild.com/images/usr/12662224782.pdf
    • http://guchen.ru/d/files/93690313942.pdf
    • https://infrastone.com/userfiles/files/61431742578.pdf
    • http://vanillasky-ch.com/images/files/kebewow.pdf
    • http://dobrejaja.com/Upload/file/kipejitewuvobigaditaropev.pdf
    • http://duet-czluchow.pl/userfiles/file/55189047708.pdf
    • https://pgp-puh.hr/fck_media/file/46501519156.pdf
    • https://living-stone.lu/userfiles/files/91881448775.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/getanujefadetes.pdf
    • https://vienhung.com/webroot/img/files/2178784268.pdf
    • http://pokemom2.com/uploads/files/93504268700.pdf
    • https://daiichitravel.com/uploads/news_file/gowome.pdf
    • https://burstallconrad.com/editor_files/file/5301993560.pdf
    • https://noursportevents.com/wheelmarine/userfiles/file/xivubufev.pdf
    • https://immobiliareincentro.it/allegati/file/81242130017.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/jorovujata.pdf
    • https://activsport.ro/userfiles/file/jagebirumukefitilezo.pdf
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/73556957049.pdf
    • http://anoh.net/pds/userfiles/files/65877311407.pdf
    • http://rfaaa.com/UploadFile/file/20210909220710348.pdf
    • http://zrdb-drogbud.pl/Upload/file/83563437781.pdf
    • http://gianniarnaudo.com/userfiles/files/redutijaralelekip.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/uddvdpkqic33tc67vb8m7gep4h/2465825250.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=123+from+amalapuram+full+movie+online
    • 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_off0000c055.bin
8a68de2e8b9b47bba1a930aaa07b32724c16814c83b674cbdba0a7cb4a061aaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC055 10664 bytes
font_01_sfnt_off0000d8c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 16792 bytes
font_02_sfnt_off0000f0d6.bin
02b4e4d2dfd7a86026a6f6512a77fdc4b8d2b327aa235957ad6f3d05ac7dd270		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 17992 bytes

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