Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a2c279dace1374…

MALICIOUS

PDF

73.5 KB Created: 2021-09-24 03:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12f68295c4ac272fb5a6b10ec4226bbc SHA-1: 6502e99668268d3b6878f44f0976022a409dd1fb SHA-256: 27a2c279dace13749931786b5148d53c498e0f848075506068b2b8ef86edda29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://leguido.net/files/sejuvafosowikipume.pdf
    • http://kccmaul.com/files/files/5276365776.pdf
    • http://dienhoabacninh.vn/webroot/img/files/95595901219.pdf
    • http://architettoseneca.com/userfiles/files/8185311623.pdf
    • http://doubles301.jp/files/ckeditor/files/nipojinun.pdf
    • http://oaklandscreche.ie/userfiles/files/tifokoxuf.pdf
    • https://arabadvertise.com/userfiles/files/dagojuzirakuwe.pdf
    • https://stalbeckers.nl/userfiles/image/file/jipusim.pdf
    • https://underworldgear.com/upload/users/files/koteviju.pdf
    • http://lavalnerina.it/userfiles/file/8311734963.pdf
    • http://rayocazar.com/images/elfinder-1.1/files/file/wuratilupepexi.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a5f496a4a---4762047433.pdf
    • https://youkuvpn.com/upload/files/69724824832.pdf
    • http://qiangka.com/ckfinder/userfiles/files/rororekejalafofus.pdf
    • http://timeyear-v.com/userfiles/file/25033834599.pdf
    • http://bookblog.kr/data/file/files/wurigomogitumovalud.pdf
    • http://kbinteriery.cz/userfiles/file/zotobi.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140afba742e5---34099259283.pdf
    • http://milwaukee.center/userfiles/file/ravanewaxubabi.pdf
    • https://tekstilkent.formenemlak.com/upload/ckfinder/files/23040735818.pdf
    • http://mudrberanova.cz/userfiles/file/kabikejaxozivo.pdf
    • http://optimaglobal.net/ckupload/files/19598504438.pdf
    • http://test-immo.com/file/74597980347.pdf
    • http://websteravelandscaping.com/editorData/file/kojonelanakesanumuz.pdf
    • http://paradisoseminatrici.it/userfiles/files/15993662582.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=bolero+of+fire+ocarina+tab
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off0000bdd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD3 16792 bytes
font_01_sfnt_off0000d5e5.bin
1b41f3c60a258b90294af03335541c6a8b27effffc3be96008dfca6bc569ed25
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E5 18452 bytes
font_02_sfnt_off000104b6.bin
22cee393534846c46280d18e9ca8a3d2b488ca6bac1c7195572fa0b5461dad60
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B6 10356 bytes