Malicious PDF — malware analysis report

Static analysis result for SHA-256 4149e2b888860614…

MALICIOUS

PDF

75.6 KB Created: 2021-04-25 02:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb0a52b4f88ed80c692ea711728e85e5 SHA-1: d3bd84cf58952f7a5f07181e9e748da20a0713de SHA-256: 4149e2b888860614c0f1a6cfb5fbbc4885321d499b97436c72d4a7986ae87cd5
96 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to 'vinyl decals' and 'wkhtmltopdf', suggesting a lure to disguise malicious intent. The presence of numerous embedded URLs, many pointing to seemingly legitimate domains but with suspicious paths, indicates a phishing or redirection attempt. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/95133977644.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/zupusozuxabodes.pdf
    • http://portal-mysigma.com/system/files/student-proof/72808970040.pdf
    • https://ambrose.edu/sites/default/files/webform/sudelo.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/12812059159.pdf
    • https://www.ofalloncasting.com/sites/default/files/webform/34904816646.pdf
    • https://www.woonsocketri.org/system/temporary/webform/makepepatamizozixijefawop.pdf
    • http://cicatsalud.com/html/sites/default/files/webform/59286961246.pdf
    • https://ambrose.edu/sites/default/files/webform/zabufenopi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+make+vinyl+decals+without+cricut
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/72323592377.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/posilo.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_off0000e816.bin
6cadcd28d75f0f27a48639e1573b82d25f8b65adb1ab1321c225d746b2382044		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 5460 bytes
font_01_sfnt_off0000fa8f.bin
cae45dc5f589e5beda9c02aeb6e701a2141d391fe876064dc307f9564901864c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 11540 bytes

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