Malicious PDF — malware analysis report

Static analysis result for SHA-256 95787bd6c2c12068…

MALICIOUS

PDF

72.7 KB Created: 2021-04-10 07:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9db0b8ee2a2947d7d44c02c1dd312e70 SHA-1: d33b0a9acc3c9a9e078be6bb77a578802c4dfdd7 SHA-256: 95787bd6c2c12068b48429b6596f68ef62b37f9cbea56f8cc8a10237993fa778
96 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded URLs, some of which are marked as unknown reputation, suggests an attempt to redirect the user to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://cicatsalud.com/html/sites/default/files/webform/kizosilubim.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/30232074114.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/tesogiruzan.pdf
    • https://www.mainephilanthropy.org/sites/default/files/30695142459.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/70645978292.pdf
    • https://architecturaldesigninc.com/sites/default/files/36110977311.pdf
    • http://seiary.com/sites/default/files/webform/rec/55418097166.pdf
    • http://oaklandchildcare.org/sites/default/files/webform/34869944823.pdf
    • http://www.grotekeukens.be/sites/default/files/webform/gmawards2018/sumeli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=critical+theory+and+science+fiction
    • https://community.princeton.edu/system/files/webform/putirufulexuxibo.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_off0000dfb8.bin
6b8b809b41744aaffd097c29824b0396b6ba1ca2008add498543fb0f3a3a4dd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB8 5116 bytes
font_01_sfnt_off0000f11d.bin
1f064f1a1d831a1f7acf96e452b497c172337dd935113dc8a042c5918f85339d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 11224 bytes

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