Malicious PDF — malware analysis report

Static analysis result for SHA-256 139d705dd9ddbcaa…

MALICIOUS

PDF

68.2 KB Created: 2021-09-19 07:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b70b50ad559e45798bf579e87f27c36d SHA-1: 8f97ff786a662a19a996a50d829bb7c59134769f SHA-256: 139d705dd9ddbcaae703de1868b882659e3cf0f9a939939633165b7a37eaf874
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to malicious websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a tactic to obscure the ultimate malicious destination, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=language+of+national+anthem+of+india PDF link annotation
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lujivufolebopegomarezu.pdfIn PDF document text
    • http://ahknchem.com/upload/files/42300254969.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/77878053426.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/zofuvujawewekowuverema.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090109553573499.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/44103843822.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/6752366612.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/misewozukitedijofi.pdfIn PDF document text
    • http://gptools.net/userfiles/file/sewinavazi.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/53846092543.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/tuxabuzibid.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/rivuvawumezilili.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/wemupozetepireputafabet.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/miwibetoja.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/davofegunuvewubabapabevim.pdfIn PDF document text
    • https://scmsgroup.org/ckfinder/userfiles/files/mevakipozosuxovozunizo.pdfIn PDF document text
    • https://hgb.se/filer/file/zogeba.pdfIn PDF document text
    • http://rapet.hu/files/gekiwim.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/24291493077.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/21070528373.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/34105138584.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/11655818929.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/53499955320.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD12 10592 bytes
SHA-256: 1557dd35591ebe2811fc8c202ffa6c49ccbe7ba4bda8d6b9fcc05c8028561b82
font_01_sfnt_off0000c4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CA 15100 bytes
SHA-256: 29d79eb1a93cea047706ca4c1489f312f0583d14c68ace0bd9bdf34fbdd8c7a6
font_02_sfnt_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.