Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a6dd753f3e7da7…

MALICIOUS

PDF

86.5 KB Created: 2021-09-13 20:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f11c6a8db2f74e33648dd39bd4b8b914 SHA-1: 3b8c8f79fb7131906274f19789cf487067b3a130 SHA-256: e5a6dd753f3e7da76ec856d46a94a0e8f7e676c2160a744914cbee2870e6231b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. 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 0.9976

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://snoman.mb.ca/ckfinder/userfiles/files/97730588631.pdf
    • http://irs-messtechnik.at/upload/mobekukarevu.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-9-10/20210910163230393920.pdf
    • http://avandcie-energy.fr/ckfinder/userfiles/files/92080679972.pdf
    • http://vinhhangvien.com/upload/files/15432405318.pdf
    • http://ordinate-ltd.com/file_media/file_image/file/55692044841.pdf
    • https://www.casestilistas.es/ckfinder/userfiles/files/fegumekida.pdf
    • http://bdsps.org/slbdavbatala/userfiles/file/20113628119.pdf
    • http://sutipatika.hu/userfiles/files/15911758837.pdf
    • http://synthecinter.com/userfiles/files/dowotoki.pdf
    • http://kxqcgs.net/filespath/files/20210907003854.pdf
    • http://support-cmu.com/filedata/file/22132986506.pdf
    • http://gruppocaminiti.it/userfiles/files/zavikekimegolij.pdf
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/16712463775.pdf
    • http://www.mmalappeenranta.com/tiedostot/files/ribuxobolaku.pdf
    • http://sissonne.hu/editor_up/tikabino.pdf
    • http://indigobaby.eu/upload/files/25180827206.pdf
    • http://tikatalog.sk/_files/file/fekokolateliraroba.pdf
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/85208021518.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c400c1377e---latiwufaxoxajiloxakesugi.pdf
    • https://kede.org/userfiles/file/vumokedutosilodafuv.pdf
    • https://conrays.ru/f/data/28931211545.pdf
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/16948069301.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=start+up+nation+book+free+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_off0000ec07.bin
f5f19dfebd6c36a22c0b7050de688bf8774a5630eb805303d90a75f13da6b4a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 18400 bytes
font_01_sfnt_off00011bb8.bin
3242398a9d3c90f388cabe849250ce60422335a0ec4449a3726c6da94567dde5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB8 10684 bytes
font_02_sfnt_off0001341c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1341C 16792 bytes

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