Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ea4fcd7cfbbfd5…

MALICIOUS

PDF

68.1 KB Created: 2021-09-27 23:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cfc740b1ab57f51db7f3e7108db9cd7f SHA-1: 03fd38f56787016f5d62f33125b2410a02461796 SHA-256: 47ea4fcd7cfbbfd5df52a3c7534a338da1b54c9187fb8b482eaabaa7c41bff3f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and the presence of embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://danfort.lv/userfiles/file/jumariwuxaxupafegige.pdf In PDF document text
    • http://vit-physio.de/file/52735082338.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/8784243092.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/84218852455.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/wuwiwukubevipin.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/35841566659.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/72386559180.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/zetajano.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/botofojapeson.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/90720831488.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/27344235279.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/gosorujokuzafuxedi.pdfIn PDF document text
    • https://ms2oke.com/contents/files/60949783906.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/dodog.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/lilisixe.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150fe2e1341f---laxidifenatarinap.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/garita.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/gikavenuwufa.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/zeduv.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/53709736405.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/fevefubiludemuza.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/84892468751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=web+series+watch+online+freePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC41 15180 bytes
SHA-256: 9b77b783d8d1ee6be442a8614a4f304c8db2830c38379d57b1b49ca3ce0115dd
font_01_sfnt_off0000d2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 10652 bytes
SHA-256: d68f36460f1aac418ae4a87600c849b3c10648cc715871be0dd2966d9b4185fc

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