Malicious PDF — malware analysis report

Static analysis result for SHA-256 1154f7be10fcfe3c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 10:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 737232843dabc32be70af1e1fd5328ea SHA-1: f62a08b80a6516002d37070f626916351d7a1ca1 SHA-256: 1154f7be10fcfe3c636f5255d6708135154d943da879eafcc70ea52f0ed6abc0
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with link farms. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect the user to potentially harmful content. While no scripts were directly extracted, the structure and heuristic firings point towards a malicious document designed to leverage external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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://luiginoiobbi.com/userfiles/file/duzotewumonimimitu.pdf
    • http://advocaatindex.nl/images/uploads/298854897.pdf
    • http://biblioteka-belzec.pl/upload/files/32306150320.pdf
    • http://kondicionery-pushkino.ru/upload_picture/file/mufanovewosir.pdf
    • http://andreuma.madteam.net/ckfinder/userfiles/files/tumugadefixagobujid.pdf
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/kewuvalalero.pdf
    • http://coimbrasoftware.hu/images/uploads/files/74521843128.pdf
    • http://aedelsur.com/contenido/files/gusakinalupigadozejabeb.pdf
    • http://aelma.com/sites/default/userfiles/file/xoribi.pdf
    • https://bokaichenyu.com/upload/files/keserokirukokeda.pdf
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/31764814293.pdf
    • http://yeongwonenc.com/userfiles/file/56664984873.pdf
    • http://debseven.net/UserFiles/File/3434122682.pdf
    • http://lngpetro.com/userfiles/file/56519016041.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4be79f48---porekuditetovewoxaxaz.pdf
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/81780002425.pdf
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/56354523329.pdf
    • https://alharithiforcameras.com/ckfinder/userfiles/files/91380560134.pdf
    • http://darstin.com/userfiles/files/84881990281.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/pivilozukumogi.pdf
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/vekidifaw.pdf
    • http://saraya-shop.ru/upload/files/26369051873.pdf
    • http://miskolciharsona.hu/pictures/file/47005769547.pdf
    • http://elitaliaweb.it/upload/file/46234638050.pdf
    • https://pannonfinanz.eu/editor_up/xukovaxiruvope.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cara+mengambil+foto+dari+video+di+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_off0000d6c8.bin
2c321832d936f7d2741da3c0d9224bed077ec95664ea219709c20256fdaa63b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 10764 bytes
font_01_sfnt_off0000ef51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 16792 bytes
font_02_sfnt_off00010763.bin
51bb615d4ff3e2c3401b98845f4586bd01489f96b50575a38908666b42ca6b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 17860 bytes

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