Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5cb92d7ce308de…

MALICIOUS

PDF

84.1 KB Created: 2021-09-17 06:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b4682d579187a901b094cb826adb8b6 SHA-1: d35528964c1db9d8f05080b4bb06d63a01e36106 SHA-256: 0b5cb92d7ce308de8080a85a31be3b17509a9fd6c8e2771749e7e6668715d671
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.007 JavaScript

The PDF document exhibits characteristics of a phishing lure, specifically employing a browser installation lure and a fake download button to trick users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may facilitate the download of a malicious payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cainghienbinhduong.com/uploads/userfiles/file/jatijuderox.pdf
    • http://omeofest.eu/userfiles/files/kejaled.pdf
    • https://sakkestadbil.no/userfiles/file/72997397147.pdf
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/44268345207.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/livabutiwanin.pdf
    • http://hai-bi.com/uploads/files/202109170813114965.pdf
    • http://zhongjiukeji.com/upload_fck/file/2021-9-7/20210907223736380120.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ka4boat5cb5v72ikv2v8njljq3/lawuxusuraxewe.pdf
    • http://proclima-membranes.ru/userfiles/file/fekemiwesovevoleme.pdf
    • http://peter-crooks.com/userfiles/file/83193772858.pdf
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/fomeziva.pdf
    • https://condicionamentofisico.com/arquivos/file/7037721009.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413b6bc239e---gokezu.pdf
    • http://medical-1669.com/userfiles/files/jazemixifejapaxedakiva.pdf
    • http://portalcom-b2b.es/img/user//file/_0948053001630826316.pdf
    • http://fohow77.ru/upload/file/31988220755.pdf
    • https://machinex-machines.com/UserFiles/File/tejajumedibejolupen.pdf
    • http://frutapacargentina.com/ckfinder/userfiles/files/55912988764.pdf
    • http://slkuang.com/v15/Upload/file/20219434599683.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3cf0f0843---depefifeloxegodojalex.pdf
    • https://kristaldicarlo.com/userfiles/file/51670447910.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mx+player+beta+latest+version+download
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/taponajorove.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_off0000e13a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 16792 bytes
font_01_sfnt_off0000f951.bin
d46b4a1a11206882f067a82019bb12994aa2080a19e62dd87a661a69166a8b71
pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 10884 bytes
font_02_sfnt_off0001127d.bin
6092a3bec532322eff197b4515fe41f2deb52b268ef501772e899b5d26197f72
pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 18180 bytes