Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a03d0bf0884e592…

MALICIOUS

PDF

72.8 KB Created: 2021-09-27 07:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e812cb5d3365277089b6e8909ecee5c9 SHA-1: d2766e92854c7b314992c936247078a403c9d760 SHA-256: 4a03d0bf0884e59276e447d4476b6281287e50527df43d9a3b6926c68a391ecb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. ML classifiers and ClamAV also strongly indicate maliciousness. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 https://mygenius.ru/admin/ckfinder/userfiles/files/matilerokutuluzezozive.pdf
    • http://rasmesafar.net/basefile/basefiles/48891794010.pdf
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/94030491190.pdf
    • https://garnizone.com/userfiles/file/tejibakatet.pdf
    • http://stlnsk.ru/uploads/file/tusaxumafesebifaxuz.pdf
    • http://zechnerbau.at/images/content/files/tevaledojas.pdf
    • http://ozkayalartrans.com/userfiles/file/20472751090.pdf
    • http://bananamusic.tw/uploads/files/202109240101411328.pdf
    • https://villanakarin.com/userfiles/files/74047895484.pdf
    • http://pieseclimaauto.com/files/file/renigitokodexo.pdf
    • http://jiin-torng.com/uploadfiles/20210913015155.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210924185611.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474ce6360d1---62171032756.pdf
    • https://nevisnews.com/userfiles/detabamejolibami.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42575813034.pdf
    • http://paulabenveniste.com/UserFiles/file/4119489262.pdf
    • http://alompar.hu/uploads/content_files/files/76101955357.pdf
    • https://bold-iot.com/uploads/files/202109262121326857.pdf
    • http://ipai-bg.eu/img/file/raputilurokovenetupusilot.pdf
    • http://emusicmarket.com/upfile/board/files/79849722129.pdf
    • http://staractivecollection.com/resimler/site/files/60464689971.pdf
    • http://iscelenie.info/files/file/belonoweremisugakuzopegun.pdf
    • http://colafranceschi.it/userfiles/files/ramiga.pdf
    • http://krakowska98.com/zdjecia/fck/file/19926417703.pdf
    • http://serbanindustrialconstruct.ro/uploads/files/35415077477.pdf
    • http://h-p-n.fr/catalogue_dynamique/file/36325868959.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=httpclient+java+android
    • 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_off0000b74b.bin
6c223c1a10f7dc9bb7fe10c7e1f25a845505d9f92c7e33a0794d309d59b72baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB74B 17796 bytes
font_01_sfnt_off0000e532.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 16792 bytes
font_02_sfnt_off0000fd49.bin
40959784267db1c6ce66ed2fd67119fcc6552008bb2b2d8f97f41f0827ca37ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 10528 bytes

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