Malicious PDF — malware analysis report

Static analysis result for SHA-256 47688c4fdc95f00f…

MALICIOUS

PDF

68.0 KB Created: 2021-09-19 00:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21d0cda93e74b44888bc081c7dbf1301 SHA-1: eb2084bce06be39566ab25f246428820c8fc4da2 SHA-256: 47688c4fdc95f00fb298b77778c1f489fd6c1fd0056029f9119186276361924f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to lead users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://krisoc.ru/uplcv?utm_term=followers+speed+apk
    • http://4darchitecture.org/img/all/10860451420.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5edcb61dda839f7921e223c7d2688a62/5976856734.pdf
    • http://www.rajpuc.pl/pics/file/segif.pdf
    • http://marinda.ru/pics/images/file/85444135683.pdf
    • http://elisa5888.com/shopadmin/upload/files/wutabu.pdf
    • http://futsalcb.cz/picture/vtextu/file/wizavizuwap.pdf
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/85197086834.pdf
    • https://mb-classic-service.de/userfiles/file/30272217503.pdf
    • https://hospvetcentral.pt/site/upload/file/7506258448.pdf
    • http://edilgroupdigiovanni.it/userfiles/files/gonukuwodefoduw.pdf
    • http://tzoetemondje.be/uploads/files/dojot.pdf
    • https://valstybestarnyba.com/upckfinder/files/48730042123.pdf
    • http://laarakkers.com/ckfinder/userfiles/files/sidufudexevajokulorota.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/kb55k1orfohah0j81rgniijgk9/17810837273.pdf
    • https://nada70.org/userfiles/file/zizifufezurogojufe.pdf
    • https://casabresciani.it/uploads/file/36126645369.pdf
    • https://cambodiadriverservice.com/userfiles/file/sezofibobidemududonazop.pdf
    • http://huyndaicaudien.com/upload/files/wewozukukolibelonupiwuva.pdf
    • http://www.verneteco.com/ckfinder/userfiles/files/18318301221.pdf
    • http://kbcsisa.com/upload/fckeditor/file/51415801436.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/potud.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/93476267881.pdf
    • https://jin-ji.com/upload/files/71544895873.pdf
    • 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_off0000aca0.bin
bf867567bab92f4a83dc090dc55b69a93708b5ed0fc8b3256622e839672a6c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACA0 15452 bytes
font_01_sfnt_off0000d3a4.bin
31962d57ea956030773daf5077c884147e64d023d59a65681f385fd742291414		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A4 10244 bytes
font_02_sfnt_off0000eade.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 16792 bytes

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