Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27cf0f0b68f168c…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 18:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6b93fcc4e07f61dfe7ca4ef78d0b38e SHA-1: b0be732a616c0c25ac29da3e170809d0cab4bc63 SHA-256: c27cf0f0b68f168c50faf981ed731c24058789bb881203007e8a3d29adf2c2c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to host malicious content. The PDF structure and embedded links are consistent with spearphishing attempts to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://csc0898.com/userfiles/file/20210924233414_iiegrl.pdf In PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210923_001256.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/weranujufigujujipatunufif.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/2810767265.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/81518222026.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/52601911667.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/jedenemogepapiferosob.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/11129450139.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/97326183317.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/40167507474.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/lidizuwuwanuzuraful.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/7542275424.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/50884285518.pdfIn PDF document text
    • http://eko-uklid.com/files/file/87242602355.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/pevatotevofupokoxi.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/53193638453.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/wafopoxonogojefujebugebup.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/39008513960.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/8722094282.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/sojubaj.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/14403372536.pdfIn PDF document text
    • http://hijoin.hu/editor_up/pojunilix.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109180544366176.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3bc9833f7---4695751741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=play+ultra+hd+movies+2020PDF 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_off0000b499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB499 16776 bytes
SHA-256: eb7be8321ed3bceea3bdcc612aca40ebeddba569e031b9be9bfe77eb6b5f4236
font_01_sfnt_off0000df68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 10932 bytes
SHA-256: cae2f6ce79b38fb228a69972cbd1ca4ed71714dab75946c06760cedcb3c646db