Malicious PDF — malware analysis report

Static analysis result for SHA-256 417b19e06d7c9446…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 08:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6981b8af8b4ae2af0da9b2d2405b3234 SHA-1: 0fa9bf371a43580f80702ed19f68f7df553877f2 SHA-256: 417b19e06d7c94466a946885bb7adbf1a2e1ca32d8cb12ec5bbbd82bd6e09a7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/wataludunorut.pdf In PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109090159078436.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/28459122199.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/vuzego.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/ziburobowimisidowuku.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/70353981382.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161389d14e9124---kuzoxisirepataselug.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/xikesuvupefusejidusugam.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/nomamafiminav.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/32490388505.pdfIn PDF document text
    • http://hotechike.com/files/files/62978936992.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/fadusowatewigigiwefatiwuz.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/kakule.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/jelowa.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/tikowisoguwurigekafo.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/3091935822.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/wonidomodovemifaromopukat.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/9011066727.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/54566824514.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/badozedatufogugixi.pdfIn PDF document text
    • http://lepal.sk/ckfinder/userfiles/files/vazotufudepapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=watch+bringing+down+the+housePDF link annotation
    • 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_off0000c8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 17604 bytes
SHA-256: 97bbeb4f69b3477d0cb4a247a15668678eec3f2bb1dec6a54761c6aa168ea43b
font_02_sfnt_off00010e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 10924 bytes
SHA-256: 49c159e3231d98cd97f65a2417fce52a46c005e6ed3ef295849ce458ca0f1eb9

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