Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f1348e72d0d5f9…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 12:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 357a0f9d110a8b1a9bf8beecb0b9c74e SHA-1: 64ed30ae54695dcd91127a0b696130c52dea739f SHA-256: 24f1348e72d0d5f9955a3986e23f7836e125b77145442c34189daa2cbd70bd96
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nomylo.ru/uplcv?utm_term=the+one+thing+goal+setting+pdf
    • https://specializedfacilitymgt.com/public_html/userfiles/file/92186643700.pdf
    • http://gps-ambroisie.com/ressource/site-image/files/miveda.pdf
    • https://businesslife.com/content/files/rulimeluxovufixebapumobuw.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/57114440303.pdf
    • http://www.lbtfilm.com/uploads/files/27985248021.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb5075cf3---digalojejinafo.pdf
    • http://stigstudiotecnico.it/userfiles/files/dejidas.pdf
    • http://anninh247.info/upload/files/10711234876.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16142615b8c89f---papanezonujerojutaxov.pdf
    • http://ulv-fogger.es/d/files/zitinomaved.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f6e17eaf5---17883592756.pdf
    • https://rheinfurth.de/userfiles/file/39223573451.pdf
    • http://ancheng-medical.com/uploadfile/files/92404937079.pdf
    • https://strategie-forex.com/ckfinder/userfiles/files/fiwedotorapixidobokej.pdf
    • http://ghibms.com/userfiles/files/62700029689.pdf
    • http://sayarbobinaj.com/file/ditavivuwezifujap.pdf
    • http://robedecreateur.com/img/files/sojativ.pdf
    • https://vhcvietnam.vn/ckeditor/images/files/13933246750.pdf
    • http://articolo17.it/siti/usr/foto/files/11420602791.pdf
    • http://cuoredicane.it/userfiles/files/74608284473.pdf
    • http://studiomalpocher.it/userfiles/files/71901265094.pdf
    • http://ryyw.com/upload/files/2021/09/202109031330304049.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_off0000e30d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 16792 bytes
font_01_sfnt_off0000fb24.bin
1d6d47b06c105963353349eaab6af58e9481f9c7c25f82bed42f86e979f8ca99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB24 10640 bytes
font_02_sfnt_off00011337.bin
172b07b6d12f72402e1c3335652dd9e16b03446e66160612b4950d2134002588		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 18656 bytes

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