Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8f2fda28429b8c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 12:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbf2ea7be0ed3c8a2ccd94e347e8ca6f SHA-1: 30952b8f4c1e9584bf2d38168ddedc7060a7361c SHA-256: ae8f2fda28429b8cd3a4074a8beb855e8c0d91b0366b42de72c08539e655a48d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this assessment, indicating a deliberate attempt to obscure the final destination through multiple redirects and disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=android+apps+not+updating+automatically
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/gowuwupazenabiwemopoz.pdf
    • http://osteriailgalloelinnamorata.com/userfiles/files/3835639148.pdf
    • https://bank-kredit.at/ckfinder/userfiles/files/lamuv.pdf
    • http://studiotecnicoforace.eu/userfiles/files/pekilukaluvupabugon.pdf
    • https://alident.centralcms.cloud/galeria/files/fumanelaxokogup.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/2445d85d0646fb5e1e7749ff2e347407/94072658558.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba207a607c---zumitukafusixadewuz.pdf
    • http://ros-grad.ru/fck_editor_files/files/wokitemedaleraku.pdf
    • https://rhuyscampingcar.fr/images/files/voziwanubivul.pdf
    • https://035620126.tw/upload/greenkitchen/files/vokewakutuxixevo.pdf
    • https://euforbiabulgaria.com/uploads/pages/files/kilenazuxifelawakilemuzim.pdf
    • http://lrpharmaceutical.com/upload/files/tivelizosinojunadokedo.pdf
    • http://xlpe.net/Images_upload/files/mogupawakowapuku.pdf
    • http://lexxyin.net/files/fckeditor/file/tezulikupatomoturo.pdf
    • https://charterfori.ir/basefile/charterforiir/files/purigevageveguxuw.pdf
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/73781880877.pdf
    • https://labelmarket.eu/data/file/78090464409.pdf
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/27126110981.pdf
    • http://caytrong.vn/Images_upload/files/21688871109.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/7nteaeh6742seacmvf52k77cc5/gisesodijagefew.pdf
    • https://www.informacion-indoorclub.com/boletines/img/file/roluk.pdf
    • http://canadanur.com/resimler/files/65240499380.pdf
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/nufugofubelerufodugog.pdf
    • http://kerekagy.hu/UserFiles/file/kezamoxemamukono.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_off0000dbef.bin
c851b19e071dde7d81c7ed959d53c5b5c086cf5cc57bbf2e8b49501df2751077		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 10920 bytes
font_01_sfnt_off0000f50b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF50B 16792 bytes
font_02_sfnt_off00010d1d.bin
edba2f83fd1043e24a151df972517c60d73860864ef73981d9650bd78881da5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1D 17960 bytes

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