Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c4aaf53c691769…

MALICIOUS

PDF

87.9 KB Created: 2021-09-17 05:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af7f17aea43f863af861e9b68a02575d SHA-1: 157f3816d1a9cfe1e3a52d8b9de94bb9ede43ba9 SHA-256: 82c4aaf53c691769e4d82d043fe1edcb582ff2f4b15b30c6f59702df1b31776f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to a link farm, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to redirect users through multiple domains. No scripts were extracted, but the overall structure and URL distribution point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://www.cavice.fi/tiedostot/files/46763992767.pdf In PDF document text
    • http://mikailang.com/userfiles/file/20210905162952_242929170.pdfIn PDF document text
    • http://esistore.be/userfiles/file/85166078012.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/84200942340.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/058223f5653ba46b9886b8f58394e6f0/21847354115.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/voguvij.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/90298166799.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/kopeniwobasizugi.pdfIn PDF document text
    • http://machulski.com/public/file/8889292749.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/66411040646.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/72443145226.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/47093514141.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/lojilolav.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/naxorenasoxavasokeli.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109102242201228.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/90381987768.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tevexiw.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/941bda4583d4d927f06fcb0cf87ec92c/92327673147.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/51298122577.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161374db1e387b---15781686027.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5addc556224d8ab690faeaf7663bee15/12721319447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+omega+ruby+hackPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/95438797334.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_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 19208 bytes
SHA-256: ecaa2ffee79ad7f6cd5d0925c1f397518ac659e9913e4e7849ffc15dc54d2e26
font_01_sfnt_off00012169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13980 10720 bytes
SHA-256: 1cfe7b5e26f7bd8a83c2e8ebac0a7ec64dcac8fbe4ee1b247b4fd346c8855c7c

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