Malicious PDF — malware analysis report

Static analysis result for SHA-256 945cdfe0b25afd26…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 07:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9cd7f4b5dd812cf423685a51829064f SHA-1: 4b10002ff048bdaa9cbeaa8886385da854afbede SHA-256: 945cdfe0b25afd2679ba05587b4c58b460a2d65a49edbb01c8508eccd06aa1bf
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious download or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://robotsuk.com/luckingbros.co.uk/userfiles/files/3734230075.pdf
    • https://doina.md/fckeditorfiles/file/28698498008.pdf
    • http://sity-luxe.ru/userfiles/file/ruriduxapapinepovefoj.pdf
    • http://csc0512.com/userfiles/file/20210911223653_73vylu.pdf
    • http://shortguycentral.com/ck_uploads/files/surexap.pdf
    • http://billsky.ee/files/file/jukatotajirani.pdf
    • https://ctsgroups.asia/images/file/7251758646.pdf
    • http://alrabbanoilandgas.com/file/files/60132579609.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/r9mfb0gkkdltc5h450sb2otm05/lagelelumezonizev.pdf
    • https://mytshirtcreator.com/app/webroot/files/file/pezafatofujubuvewoleb.pdf
    • http://afslab.asia/upload/files/puziwu.pdf
    • http://wxmx.cn/upload/ckimg/files/202109160258065202.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/basinade.pdf
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/voxudijuxetegopogalafuvo.pdf
    • https://8cj2aja7-8mxb.com/contents/files/61361853609.pdf
    • http://flairpens.ru/uploads/file/32367077350.pdf
    • https://radiosmile.hu/upload/file/91715233520.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/wagivukuba.pdf
    • https://alquimia.in/admin/fckeditor/editorfile/nivamul.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441877733e2---60200556308.pdf
    • http://svatba-emi.com/uploads/pages/files/xemudiluxapewelulumidutog.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/zavupemubisuxudasig.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=freeflix+hq+online
    • 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_off0000cb20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 16792 bytes
font_01_sfnt_off0000e337.bin
e105e58bd6f7b0b62ea772b7e764403f747636ee2e7cde6347ad9feee946dc3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE337 10108 bytes
font_02_sfnt_off0000f994.bin
54f21d4a8e64448a97dafdc752dfadfe12b3e4b3af2a63998145fef694f92641		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 17832 bytes

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