Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a72b3fb654186bc…

MALICIOUS

PDF

67.4 KB Created: 2021-04-22 23:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea3e335eb562b6d68081e6b473b9e904 SHA-1: 14166b8621737a4755955e0405eac5aa8c7f74e5 SHA-256: 0a72b3fb654186bc74887a67057f1501102421eb0655aa5d439586f001244b22
96 Risk Score

Malware Insights

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

The file is a PDF document that uses a seemingly innocuous topic ('How to fill a wagner steamer') to trick users into clicking embedded links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing purposes. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.uts.cw/sites/default/files/webform/50818196885.pdf
    • https://www.afscme65.org/system/files/webform/baxuwobokorexifiri.pdf
    • https://vectorcorp.net/sites/default/files/webform/resume/92207600326.pdf
    • https://www.mothercare.ro/sites/default/files/webform/resumes/topijetidilotifoga.pdf
    • https://www.jts.org.jo/sites/default/files/webform/76938035167.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/fipeforivu.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/10654010608.pdf
    • http://www.friendlycc.com/sites/default/files/webform/tojatovovezugunubi.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/tojawi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+fill+a+wagner+steamer
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/8342566550.pdf
    • https://community.princeton.edu/system/files/webform/13590028771.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/5272012193.pdf
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/10713621665.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb18.bin
1897936d3a204a704362aff4323ba11230a4697668bc20a2f423dceb3ed8b27a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB18 5140 bytes
font_01_sfnt_off0000dc96.bin
dcf3f57b0f83fb3bf7ec7711fcfa55c56b639f6a893c9731892f36aec0c0bcf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC96 10728 bytes

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