Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bae1283b4606ca…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 12:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc7f6677a29433f27ede308b664a0648 SHA-1: 576c697624abf10d83d1d24bee4bd064d8058621 SHA-256: c6bae1283b4606cae792bca2f5339316e2a957b32bb81dd5e837de56ccc79ba4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs that point to various domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a deceptive structure for traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/55920782790.pdf
    • https://www.tvmreza.tv/ckfinder/userfiles/files/3065217291.pdf
    • http://resortcrimea.com/ckfinder/userfiles/files/dukosofopadijuk.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/xofagovete.pdf
    • http://banglenhospital.com/UserFiles/File/tinomodo.pdf
    • http://atlonnuri.org/UpLoadImage/editer/files/tupufotokixinu.pdf
    • https://www.assofmt.org/ckfinder/userfiles/files/2044432515.pdf
    • http://atdawnwelift.com/userfiles/file/41804569495.pdf
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17241475861.pdf
    • http://eternaseguros.net/files/files/dufavadafekemovovidofagi.pdf
    • https://relans-nn.ru/images/docs/file/41891189069.pdf
    • http://hotelgiottotorino.com/userfiles/files/20910882476.pdf
    • https://siam-royal-view.ru/data/files/985354769.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/31918830641.pdf
    • https://galerieportelouise.be/userfiles/files/xixuze.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/963127872.pdf
    • https://okazionche.com/files/zovenexisifewedojowabu.pdf
    • http://strandedtattoo.net/file/zedeg.pdf
    • http://nedirajtebosnu.net/userfiles/file/28298537602.pdf
    • https://spotiverify.com/ci/userfiles/files/4423612227.pdf
    • http://soupworld.de/upload/file/mewutet.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/95721098615.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bollywood+evergreen+movies+download
    • 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_off0000e109.bin
0b0af3703173ebef8845e4f85d0a19f6f9db076d36bc6b9ccd034dd77683d014
pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 10812 bytes
font_01_sfnt_off0000f9c4.bin
1c5d95ca3e7096ea80bc37c8aedf85e4a50684048662d0ebc4207ff1de9c94f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 17968 bytes
font_02_sfnt_off00012841.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12841 16792 bytes