Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf67a497081e0e4…

MALICIOUS

PDF

67.7 KB Created: 2021-04-11 08:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e356b24cc5491f110c1c4384fb70aebc SHA-1: d06b2e04e545947706284b9f583653bca1ab3a1f SHA-256: bbf67a497081e0e424bdf10c70ff5b7157422bce424fc3e5177d68a7acfd7ff8
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 a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a spearphishing attachment attack vector.

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.osgeurope.com/sites/osg-corporate.dev/files/webform/35757612566.pdf
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/10654010608.pdf
    • http://www.sumnercountyhospital.org/sites/default/files/webform/sinuwoxifazuroli.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/fapulewamekunasu.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/64296936159.pdf
    • https://www.termis.org/system/files/webform/vomijalikuwukilowerosi.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/tesogiruzan.pdf
    • http://seiary.com/sites/default/files/webform/rec/55418097166.pdf
    • https://www.cdcplumbing.com/sites/default/files/webform/contact-us/sawifujemenolezaf.pdf
    • https://natsihwa.org.au/sites/default/files/webform/degajakuko.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/nojezajewi.pdf
    • https://ambrose.edu/sites/default/files/webform/11118021720.pdf
    • https://extranet.blanchisserie-toulousaine-de-sante.com/sites/extranet.blanchisserie-toulousaine-de-sante.com/files/documents/justificatifs/29410319198.pdf
    • http://www.pbttphtk.gov.my/sites/default/files/webform/88462653206.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=aprendizaje+entre+pares
    • https://community.princeton.edu/system/files/webform/fivedexexefo.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_off0000ca9b.bin
130c9b1c4fad75f6feca9921d42db34f1cacd1486202f21ff1ca409403dac057
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9B 5036 bytes
font_01_sfnt_off0000dbd3.bin
e5cabb8a6b180bf8eda2d5c067bf1052d675d1e33ab0eb9d6c44571b5de3ff38
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 11992 bytes